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density
why is it necessary to indicate temperature when giving density values of liquids?
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It's necessary because at higher temperatures, substances will expand, and at lower temperatures, they'll contract.
Density = Mass/Volume
So, if volume is higher (because the liquid expanded) the density will be lower, because it's the same mass in a larger volume.
It works the same way for solids and gases, with the exception of water, which expands as a solid.
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Most liquids change density according to temperature. Water's density is different at 32°F, 74°F and 200°F. I think its just for standard procedure reasons, to get you used to it.
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