Q: Does changing the mass of water change the mass of 1 cm3 of water?

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No. It may change its weight if weighed at varying depths.

The mass of water is 1g per cm3

yes

Density = mass/volume = 5.4g/(9*2*6) cm3 = 5.4/108 cm3 = 0.05 g/cm3. The density of water at normal pressure is very slightly less than 1 g/cm3. The substance that you have, with a density of a twentieth of that cannot be water.

"Gram" is a unit of mass. "Cm3" is a unit of volume. So the answer depends on what substance is in the cm3 . If the cm3 is empty, then there are no grams in it. If it's full of air, then there's only a small fraction of a gram in it. If it's a cm3 of water, then there's roughly 1 gram of mass in it. If it's a cm3 of gold, then there are about 19 grams of mass in it.

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No. It may change its weight if weighed at varying depths.

The mass of water is 1g per cm3

the mass is i gram

yes

It 1.00 gram/cm3

1 cm3 of water weighs 1 gram. The volume is...ermm... 1 cm3

25 g

The volume of a sample of water is 20 cm3. The mass of this sample is closest to

Denisity = Mass/Volume Therefore the Denisty of water multiplied by the volume will give you the mass. Check your units though you may need to convert them. Also you will not need the mass of the cylinder unless you need the total mass. Hope this helps. -------------------- The density of water is equal to 1 gram per cm3 at a specific temperature and pressure but it is not far from it throughout everyday temperatures and pressures. So, for all intents and purposes, the density of water can be taken to be 1 gm/cm3. The volume of the cylinder is 346.76 cm3, that is, it will hold 346.76 cm3 of water. At 1 gram per cm3, that volume of water will have a mass of 346.76 grams.

Density = mass/volume = 5.4g/(9*2*6) cm3 = 5.4/108 cm3 = 0.05 g/cm3. The density of water at normal pressure is very slightly less than 1 g/cm3. The substance that you have, with a density of a twentieth of that cannot be water.

I took the liberty of changing the density to 5g/cm3 since 5g would be a mass quantity, and the volume to 10cm3, since 10cm would be a length quantity. density = mass/volume mass = density x volume = 5g/cm3 x 10cm3 = 50g

Water has a density of 1 gram/cm3.