Density = Mass/Volume = 100 grams / 4 mL = 24 grams per mL.
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Density=mass/volume.......but make sure units match up.
Density is kinda like how much pressure an object takes up. You need to do mass divided by volume to get the density.
Density is how tightly packed the matter in a substance is. Therefore, how much space it takes up (volume) will not affect this.
Yes, water expands as it freezes. Liquid water's density is about 1.0 g/mL, but ice's density is 0.92 g/mL. See related link.
put the pencil into a measuring jug filled with water to 100g the when you put the pencil in you see how much it has gone up . if it has gone up to 150g the pencil will the 50g in area. because you put in 100g of water