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There can be no equivalence.

A gram is a measure of mass. A cubic centimetre (cc) is a measure of volume. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid.

If you are not convinced, consider a cc of air. How many grams? Next consider a cc of lead. How many grams?

The masses of equal volumes of the two substances will clearly be very different. So there is no direct conversion between mass and volume: you need to know the density of the substance to enable you to carry out the conversion.

Furthermore, it is widely but incorrectly believed that the density of water is 1 gram per cc. This has been false since the litre was redefined in 1964. At a pressure of one atmosphere, pure water attains its maximum density at 4 deg C and that density is 0.999 972 0 g/cc : nearly 1, yes, but not = 1.

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10y ago
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James Ross

Lvl 2
3w ago

5 grams

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Q: How many gm is 7.5 cc?
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