Sound vs. Valid — What's the Difference?
By Maham Liaqat & Fiza Rafique — Updated on March 25, 2024
A sound argument is both valid and has true premises, while a valid argument has a logical structure where the conclusion necessarily follows from the premises, regardless of their truth.
Difference Between Sound and Valid
Table of Contents
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Key Differences
Soundness in logic refers to an argument that is not only valid but also based on premises that are actually true, ensuring the conclusion is true as well. Whereas validity concerns the form of the argument, meaning if the premises were true, then the conclusion must be true, without regard to the actual truth of the premises.
A sound argument guarantees the truth of the conclusion due to its true premises and valid structure. On the other hand, a valid argument does not guarantee the truth of the conclusion unless its premises are known to be true, which is not a requirement for validity.
For an argument to be sound, it must meet two criteria: it must be valid, and all its premises must be true in reality. Validity, however, solely requires that the conclusion logically follows from the premises, a criterion that does not necessitate the premises' factual accuracy.
The concept of soundness applies strictly in formal logic and philosophical discussions, emphasizing the importance of both logical structure and factual premises. Validity, though essential in logical and critical thinking, is more focused on the argument's form rather than the veracity of its premises.
While a sound argument is inherently valid, not all valid arguments are sound. This distinction highlights the additional requirement for truth in the premises for an argument to be considered sound.
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Comparison Chart
Definition
An argument that is valid and has all true premises.
An argument where the conclusion logically follows from the premises.
Premises
Must be true.
Do not need to be true, only logically connected to the conclusion.
Conclusion
Must be true if the argument is sound.
Is logically consistent with the premises but not necessarily true.
Requirement
Validity and true premises.
Logical structure where the conclusion follows from the premises.
Application
Used to evaluate both the form and factual correctness of an argument.
Used to evaluate the logical structure of an argument.
Compare with Definitions
Sound
Valid with all true premises, leading to a true conclusion.
The argument that All men are mortal; Socrates is a man; therefore, Socrates is mortal is sound.
Valid
Can be applied to arguments with false, hypothetical, or fictional premises.
In fictional contexts, characters often engage in valid reasoning that doesn't reflect real truths.
Sound
Reflects an argument's reliability and credibility.
His sound reasoning convinced everyone in the discussion.
Valid
Describes an argument whose conclusion logically follows from its premises.
The argument is valid, as the conclusion cannot be false if the premises are true.
Sound
Emphasizes the importance of truth in premises for the correctness of conclusions.
For a debate to be sound, it must be built on verified information.
Valid
Focuses on the structure of the argument rather than the truth of the premises.
Although the premises are hypothetical, the argument is still valid.
Sound
Applied in contexts requiring stringent logical and factual analysis.
Scientific theories are often supported by sound arguments.
Valid
Does not imply that the premises or conclusion are true in reality.
The argument's validity doesn't guarantee its conclusion is true.
Sound
In logic, denotes an argument that cannot be logically disputed due to its structure and factual premises.
Using undeniable facts and valid reasoning, the argument is sound.
Valid
A key concept in formal logic and critical thinking.
Learning to construct valid arguments is essential in philosophy.
Sound
In physics, sound is a vibration that propagates as an acoustic wave, through a transmission medium such as a gas, liquid or solid. In human physiology and psychology, sound is the reception of such waves and their perception by the brain.
Valid
Well grounded; just
A valid objection.
Sound
Vibrations transmitted through an elastic solid or a liquid or gas, with frequencies in the approximate range of 20 to 20,000 hertz, capable of being detected by human organs of hearing.
Valid
Producing the desired results; efficacious
Valid methods.
Sound
Transmitted vibrations of any frequency.
Valid
Having legal force; effective or binding
A valid title.
Sound
The sensation stimulated in the organs of hearing by such vibrations in the air or other medium.
Valid
Containing premises from which the conclusion may logically be derived
A valid argument.
Sound
Such sensations considered as a group.
Valid
Correctly inferred or deduced from a premise
A valid conclusion.
Sound
A distinctive noise
A hollow sound.
Valid
(Archaic) Of sound health; robust.
Sound
The distance over which something can be heard
Within sound of my voice.
Valid
Well grounded or justifiable, pertinent.
I will believe him as soon as he offers a valid answer.
Sound
An articulation made by the vocal apparatus
A vowel sound.
Valid
Acceptable, proper or correct; in accordance with the rules.
A valid format for the date is DD/MM/YY.
Do not drive without a valid license.
Sound
The distinctive character of such an articulation
The words bear and bare have the same sound.
Valid
Related to the current topic, or presented within context, relevant.
Sound
A mental impression; an implication
Didn't like the sound of the invitation.
Valid
(logic) Of a formula or system: such that it evaluates to true regardless of the input values.
Sound
Auditory material that is recorded, as for a movie.
Valid
(logic) Of an argument: whose conclusion is always true whenever its premises are true.
An argument is valid if and only if the set consisting of both (1) all of its premises and (2) the contradictory of its conclusion is inconsistent.
Sound
Meaningless noise.
Valid
Genuine - as distinguished from efficient or regular - sacrament.
Sound
(Music) A distinctive style, as of an orchestra or singer.
Valid
Strong; powerful; efficient.
Sound
(Archaic) Rumor; report.
Valid
Having sufficient strength or force; founded in truth; capable of being justified, defended, or supported; not weak or defective; sound; good; efficacious; as, a valid argument; a valid objection.
An answer that is open to no valid exception.
Sound
A long, relatively wide body of water, larger than a strait or a channel, connecting larger bodies of water.
Valid
Having legal strength or force; executed with the proper formalities; incapable of being rightfully overthrown or set aside; as, a valid deed; a valid covenant; a valid instrument of any kind; a valid claim or title; a valid marriage.
Sound
A long, wide ocean inlet.
Valid
Well grounded in logic or truth or having legal force;
A valid inference
A valid argument
A valid contract
A valid license
Sound
(Archaic) The swim bladder of a fish.
Valid
Still legally acceptable;
The license is still valid
Sound
An instrument used to examine or explore body cavities, as for foreign bodies or other abnormalities, or to dilate strictures in them.
Sound
To make or give forth a sound
The siren sounded.
Sound
To be given forth as a sound
The fanfare sounded.
Sound
To present a particular impression
That argument sounds reasonable.
Sound
To cause to give forth or produce a sound
Sounded the gong.
Sound
To summon, announce, or signal by a sound
Sound a warning.
Sound
(Linguistics) To articulate; pronounce
Sound a vowel.
Sound
To make known; celebrate
"Nations unborn your mighty names shall sound" (Alexander Pope).
Sound
To examine (a body organ or part) by causing to emit sound; auscultate.
Sound
To measure the depth of (water), especially by means of a weighted line; fathom.
Sound
To try to learn the attitudes or opinions of
Sounded out her feelings.
Sound
To probe (a body cavity) with a sound.
Sound
To measure depth.
Sound
To dive swiftly downward. Used of a marine mammal or a fish.
Sound
To look into a possibility; investigate.
Sound
Free from defect, decay, or damage; in good condition
Is the bridge sound?.
Sound
Free from disease or injury.
Sound
Marked by or showing common sense and good judgment; levelheaded
A sound approach to the problem.
Sound
Based on valid reasoning; having no logical flaws
A sound conclusion.
Sound reasoning.
Sound
(Logic) Of or relating to an argument in which all the premises are true and the conclusion follows from the premises.
Sound
Secure or stable
A partnership that started on a sound footing.
Sound
Financially secure or safe
A sound economy.
Sound
Thorough; complete
Gave their rivals a sound thrashing.
Sound
Deep and unbroken; undisturbed
A sound sleep.
Sound
Compatible with an accepted point of view; orthodox
Sound doctrine.
Sound
Thoroughly; deeply
Sound asleep.
Sound
Healthy.
He was safe and sound.
In horse management a sound horse is one with no health problems that might affect its suitability for its intended work.
Sound
Complete, solid, or secure.
Fred assured me the floorboards were sound.
Sound
Having the property of soundness.
Sound
Good; acceptable; decent.
How are you? —I'm sound.
That's a sound track you're playing.
See that man over there? He's sound. You should get to know him.
Sound
(of sleep) Quiet and deep.
Sound asleep means sleeping peacefully, and often deeply.
Her sleep was sound.
Sound
Heavy; laid on with force.
A sound beating
Sound
Founded in law; legal; valid; not defective.
A sound title to land
Sound
Soundly.
Sound
Yes; used to show agreement or understanding, generally without much enthusiasm.
I found my jacket. — Sound.
Sound
A sensation perceived by the ear caused by the vibration of air or some other medium.
He turned when he heard the sound of footsteps behind him.
Nobody made a sound.
Sound
A vibration capable of causing such sensations.
Sound
(music) A distinctive style and sonority of a particular musician, orchestra, &.
Sound
Noise without meaning; empty noise.
Sound
, distance within which a certain noise may be heard.
Stay within the sound of my voice.
Sound
(phonetics) A segment as a part of spoken language, the smallest unit of spoken language, a speech sound.
Sound
A long narrow inlet, or a strait between the mainland and an island; also, a strait connecting two seas, or connecting a sea or lake with the ocean.
Puget Sound; Owen Sound; Long Island Sound
Sound
The air bladder of a fish.
Cod sounds are an esteemed article of food.
Sound
A long, thin probe for sounding or dilating body cavities or canals such as the urethra; a sonde.
Sound
(intransitive) To produce a sound.
When the horn sounds, take cover.
Sound
(copulative) To convey an impression by one's sound.
He sounded good when we last spoke.
That story sounds like a pack of lies!
Sound
(intransitive) To be conveyed in sound; to be spread or published; to convey intelligence by sound.
Sound
To resound.
Sound
To arise or to be recognizable as arising in or from a particular area of law, or as likely to result in a particular kind of legal remedy.
In my opinion this claim sounds in damages rather than in an injunction.
Sound
(transitive) To cause to produce a sound.
Sound the alarm!
He sounds the instrument.
Sound
To pronounce.
The "e" in "house" isn't sounded.
Sound
(intransitive) Dive downwards, used of a whale.
The whale sounded and eight hundred feet of heavy line streaked out of the line tub before he ended his dive.
Sound
To ascertain, or try to ascertain, the thoughts, motives, and purposes of (a person); to examine; to try; to test; to probe.
When I sounded him, he appeared to favor the proposed deal.
Sound
Test; ascertain the depth of water with a sounding line or other device.
Mariners on sailing ships would sound the depth of the water with a weighted rope.
Sound
(medicine) To examine with the instrument called a sound or sonde, or by auscultation or percussion.
To sound a patient, or the bladder or urethra
Sound
The air bladder of a fish; as, cod sounds are an esteemed article of food.
Sound
A cuttlefish.
Sound
A narrow passage of water, or a strait between the mainland and an island; also, a strait connecting two seas, or connecting a sea or lake with the ocean; as, the Sound between the Baltic and the german Ocean; Long Island Sound.
The Sound of Denmark, where ships pay toll.
Sound
Any elongated instrument or probe, usually metallic, by which cavities of the body are sounded or explored, especially the bladder for stone, or the urethra for a stricture.
Sound
The peceived object occasioned by the impulse or vibration of a material substance affecting the ear; a sensation or perception of the mind received through the ear, and produced by the impulse or vibration of the air or other medium with which the ear is in contact; the effect of an impression made on the organs of hearing by an impulse or vibration of the air caused by a collision of bodies, or by other means; noise; report; as, the sound of a drum; the sound of the human voice; a horrid sound; a charming sound; a sharp, high, or shrill sound.
The warlike soundOf trumpets loud and clarions.
Sound
The occasion of sound; the impulse or vibration which would occasion sound to a percipient if present with unimpaired; hence, the theory of vibrations in elastic media such cause sound; as, a treatise on sound.
Sound
Noise without signification; empty noise; noise and nothing else.
Sense and not sound . . . must be the principle.
Sound
Whole; unbroken; unharmed; free from flaw, defect, or decay; perfect of the kind; as, sound timber; sound fruit; a sound tooth; a sound ship.
Sound
Healthy; not diseased; not being in a morbid state; - said of body or mind; as, a sound body; a sound constitution; a sound understanding.
Sound
Firm; strong; safe.
The brasswork here, how rich it is in beams,And how, besides, it makes the whole house sound.
Sound
Free from error; correct; right; honest; true; faithful; orthodox; - said of persons; as, a sound lawyer; a sound thinker.
Do not I know you a favorerOf this new seat? Ye are nor sound.
Sound
Founded in truth or right; supported by justice; not to be overthrown on refuted; not fallacious; as, sound argument or reasoning; a sound objection; sound doctrine; sound principles.
Hold fast the form of sound words, which thou hast heard of me.
Sound
Heavy; laid on with force; as, a sound beating.
Sound
Undisturbed; deep; profound; as, sound sleep.
Sound
Founded in law; legal; valid; not defective; as, a sound title to land.
Sound
Soundly.
So sound he slept that naught might him awake.
Sound
To measure the depth of; to fathom; especially, to ascertain the depth of by means of a line and plummet.
Sound
To explore, as the bladder or urethra, with a sound; to examine with a sound; also, to examine by auscultation or percussion; as, to sound a patient.
Sound
To ascertain the depth of water with a sounding line or other device.
I sound as a shipman soundeth in the sea with his plummet to know the depth of sea.
Sound
To make a noise; to utter a voice; to make an impulse of the air that shall strike the organs of hearing with a perceptible effect.
How silver-sweet sound lovers' tongues!
Sound
To be conveyed in sound; to be spread or published; to convey intelligence by sound.
From you sounded out the word of the Lord.
Sound
To make or convey a certain impression, or to have a certain import, when heard; hence, to seem; to appear; as, this reproof sounds harsh; the story sounds like an invention.
Good sir, why do you start, and seem to fearThings that do sound so fair?
Soun[d]ing in moral virtue was his speech.
Sound
To cause to make a noise; to play on; as, to sound a trumpet or a horn; to sound an alarm.
A bagpipe well could he play and soun[d].
Sound
To cause to exit as a sound; as, to sound a note with the voice, or on an instrument.
Sound
To order, direct, indicate, or proclain by a sound, or sounds; to give a signal for by a certain sound; as, to sound a retreat; to sound a parley.
The clock sounded the hour of noon.
Sound
To celebrate or honor by sounds; to cause to be reported; to publish or proclaim; as, to sound the praises of fame of a great man or a great exploit.
Sound
To examine the condition of (anything) by causing the same to emit sounds and noting their character; as, to sound a piece of timber; to sound a vase; to sound the lungs of a patient.
Sound
To signify; to import; to denote.
Soun[d]ing alway the increase of his winning.
Sound
The particular auditory effect produced by a given cause;
The sound of rain on the roof
The beautiful sound of music
Sound
The subjective sensation of hearing something;
He strained to hear the faint sounds
Sound
Mechanical vibrations transmitted by an elastic medium;
Falling trees make a sound in the forest even when no one is there to hear them
Sound
The sudden occurrence of an audible event;
The sound awakened them
Sound
The audible part of a transmitted signal;
They always raise the audio for commercials
Sound
(phonetics) an individual sound unit of speech without concern as to whether or not it is a phoneme of some language
Sound
A narrow channel of the sea joining two larger bodies of water
Sound
A large ocean inlet or deep bay;
The main body of the sound ran parallel to the coast
Sound
Appear in a certain way;
This sounds interesting
Sound
Make a certain noise or sound;
She went `Mmmmm'
The gun went `bang'
Sound
Give off a certain sound or sounds;
This record sounds scratchy
Sound
Announce by means of a sound;
Sound the alarm
Sound
Utter with vibrating vocal chords
Sound
Cause to sound;
Sound the bell
Sound a certain note
Sound
Measure the depth of (a body of water) with a sounding line
Sound
Financially secure and safe;
Sound investments
A sound economy
Sound
Exercising or showing good judgment;
Healthy scepticism
A healthy fear of rattlesnakes
The healthy attitude of French laws
Healthy relations between labor and management
An intelligent solution
A sound approach to the problem
Sound advice
No sound explanation for his decision
Sound
In good condition; free from defect or damage or decay;
A sound timber
The wall is sound
A sound foundation
Sound
In excellent physical condition;
Good teeth
I still have one good leg
A sound mind in a sound body
Sound
Reflects weight of sound argument or evidence;
A sound argument
Sound
Having legal efficacy or force;
A sound title to the property
Sound
Free from moral defect;
A man of sound character
Sound
(of sleep) deep and complete;
A heavy sleep
Fell into a profound sleep
A sound sleeper
Deep wakeless sleep
Sound
Thorough;
A sound thrashing
Sound
Deeply or completely;
Slept soundly through the storm
Is sound asleep
Common Curiosities
What is a sound argument?
A sound argument is both valid and based on true premises, leading to a true conclusion.
Can an argument be valid but not sound?
Yes, if an argument has a logical structure but contains false premises, it is valid but not sound.
How do you determine if an argument is sound?
To determine soundness, check for both the argument's validity and the truthfulness of its premises.
Is it possible for a sound argument to have a false conclusion?
No, a sound argument, by definition, cannot have a false conclusion since its premises are true and the reasoning is valid.
What makes an argument unsound?
An argument is unsound if it is either invalid or has one or more false premises.
How do mathematicians use sound arguments?
Mathematicians use sound arguments to establish irrefutable proofs based on true premises and valid logic.
What role does truth play in a valid argument?
In a valid argument, the focus is on logical connectivity rather than the truth of the premises or conclusion.
Why is validity important in arguments?
Validity ensures that the conclusion logically follows from the premises, which is crucial for coherent reasoning.
Does every valid argument convey useful information?
Not necessarily; a valid argument can have true logical form but use unrealistic or hypothetical premises, limiting its real-world applicability.
Is empirical evidence required to prove an argument sound?
Yes, empirical evidence may be needed to verify the truth of the premises in a sound argument.
How do logical fallacies affect an argument's validity and soundness?
Logical fallacies can undermine an argument's validity and prevent it from being sound by introducing errors in reasoning or factual inaccuracies.
How does the concept of soundness benefit logical analysis?
Soundness provides a comprehensive standard, evaluating both logical structure and factual accuracy, for robust argumentation.
What is the significance of having true premises in an argument?
True premises are crucial for ensuring the reliability and truthfulness of the argument's conclusion in real-world contexts.
Can the truth of the premises change an argument's soundness?
Yes, if initially untrue premises are later proven true, an argument can become sound.
Can an argument's validity be affected by new evidence?
No, validity concerns the logical structure, which remains unaffected by new evidence, unlike soundness, which can be influenced by the truth of the premises.
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Fiza RafiqueFiza Rafique is a skilled content writer at AskDifference.com, where she meticulously refines and enhances written pieces. Drawing from her vast editorial expertise, Fiza ensures clarity, accuracy, and precision in every article. Passionate about language, she continually seeks to elevate the quality of content for readers worldwide.