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What is the difference between matter and substance?

For example, are ice and water "the same matter" or "the same substance"?

Dictionaries seem vague about the difference. For example, the Oxford Advanced Learner's Dictionary states that matter is "a physical substance in general" or "substance, material or things of a specified kind", while substance is a "particular type of matter".

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NOAD says:

matter (n.): physical substance in general, as distinct from mind and spirit; (in physics) that which occupies space and possesses rest mass, esp. as distinct from energy.

substance (n.): 1 a particular kind of matter with uniform properties : a steel tube coated with a waxy substance. 2 the real physical matter of which a person or thing consists and which has a tangible, solid presence.

It's easy to see why you'd have trouble with the two words. Their definitions are circularly defined, so there is some obvious synonymous overlap.

That said, there are certain contexts where one word sounds inherently more appropriate than the other. Here are a few examples:

Water and ice are the same substance.
There was a stange yellow substance left on the windshield.
No substance in the world would give a human being the strength of Superman.
Much of the matter reconverged after the supernova explosion.
Satellites stay in orbit due to the earth's gravitational pull on matter.
Stars are made up of hydrogen, helium, and a small percentage of other matter.
The most common substance in stars is hydrogen.

In such sentences, how would someone know when to use matter, and when to use substance? As I pondered this question, the best technique I was able to devise came from keying on this part of NOAD's first definition of substance:

a particular kind of matter

I realized, if I could use "[a] particular kind of matter" in the sentence, then the word substance would probably be the better fit. For example:

Water and ice are the same matter.
Water and ice are the same particular kind of matter.

The second sentence conveys the sentiment more accurately; so, it would be better to use the word substance. Similarly:

There was a stange yellow matter left on the windshield.
There was a stange yellow particular kind of matter left on the windshield.

Again, substance is the better fit. However:

Much of the matter reconverged after the supernova explosion.
Much of a particular kind of matter reconverged after the supernova explosion.

In that case, the meaning is obscured by inserting "a particular kind of", so matter is the better word to use.

Satellites stay in orbit due to the earth's gravitational pull on matter.
Satellites stay in orbit due to the earth's gravitational pull on a particular kind of matter.

Once again, gravity affects all matter, not just a particular kind of matter used in satellites, so matter is the better word.

I'll repeat this exercise for another sentence from my initial examples:

Stars are made up of hydrogen, helium, and a small percentage of other matter.

is OK, because I would not say:

Stars are made up of hydrogen, helium, and a small percentage of another particular kind of matter.

because there are more than three elements in most stars. However, I could say:

Stars are made up of hydrogen, helium, and a small percentage of other particular kinds of matter.

meaning I could also say:

Stars are made up of hydrogen, helium, and a small percentage of other substances.

Lastly:

The most common substance in stars is hydrogen.

is left as an exercise for the reader.

I wouldn't go so far as to say this is a hard and fast rule for determining when to use matter or substance, but it doesn't appear to be a bad initial analysis.

One other footnote: this methodology works when the two words are being used in a similar context, and would not apply to other contexts, such as a financial matter, or the substance of an argument, or to idiomatic uses (such as gray matter for intelligence).

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  • 1
    Your answer is very enlightening, thank you very much! While reading your examples another way of phrasing the distinction came to my mind: Could it be that "matter" is used when the actual substance doesn't matter, and "substance" is used when the actual substance matters?
    – escargot agile
    Commented Nov 24, 2012 at 1:06
  • @IlyaKogan: Yes, I think so. That's a rather informal way to describe it; nevertheless, it seems to be a nice and succint way describe the distinction.
    – J.R.
    Commented Nov 24, 2012 at 1:20
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    I'm deleting my answer in favour of this one. It's a bit long, but nice and clear.
    – FumbleFingers
    Commented Nov 24, 2012 at 1:27
  • J.R., in the name of completeness you would have cited the "antimatter" too; for at least concluding that the *antisubstance does not exisit. So the parallelism between the two is totally broken.
    – user19148
    Commented Nov 24, 2012 at 2:23
  • @Carlo_R.: I think my answer is long enough as it is. As I inferred in my closing paragraph, there are many other contexts in which these two words are used, and my answer was focused solely on the near-synonymous contexts of those two original words. Antimatter? That's another matter altogether. :^)
    – J.R.
    Commented Nov 24, 2012 at 9:21
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There is a particular, specialised and esoteric difference between matter and substance according to the theology of the Catholic Church.

Matter is what a thing is made of; substance is what makes it what it is (its quintessence, perhaps). This is the basis of transubstantiation, the change of substance. In the Eucharist, the bread and wine retain the physical form of bread and wine; their matter does not change. But in the sacrament, their substance changes from mere food to the Body and Blood of Christ.

This may not be immediately relevant to the question, but in a site which aims to provide complete answers, it's probably necessary to include it.

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    I agree it's worth including - but as you say, it's probably not immediately relevant to the question. So I think maybe it would have been better as a comment (assuming you could squeeze the substance into 600 chars).
    – FumbleFingers
    Commented Nov 23, 2012 at 22:18
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    Comments are ephemeral, though, and this is an answer to the question in the title. Someone might want just this answer.
    – Andrew Leach ♦
    Commented Nov 23, 2012 at 22:20
  • I keep forgetting that! You're quite right - even if we end up knowing exactly what the OP is after, people in future might come to the question looking for a somewhat different tak on things (perhaps we should tack "and pus" on the end of the question! :)
    – FumbleFingers
    Commented Nov 24, 2012 at 0:38

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