They're not.
Weight is the force produced on a mass by gravity.
Volume is totally independent.
The weight of the rock will be lessened by the weight of the same volume of water. If the rock weighs less than that volume of water, it will float (as does pumice). Thus, if you had a rock that has a density (weight/volume) of 2 times the same volume of water, it would weigh one half of its dry weight when in water.
WATER
No.
The weight depends on the volume, or size, and the density of the band. In the same way, a book's weight depends on its volume and density.
Your weight will be the same as a volume of mercury of equivalent weight.
No, sand and water do not weigh the same for the same volume. Water has a density of 1 gram per cubic centimeter, while the density of sand varies but is generally higher, so the weight of the same volume of sand will be greater than that of water.
mass involves weight....volume is size. A ballon and a loaf of bread may have the same volume (occupy the same space) , but the bread has more volume.
The difference between an object's weight, and the weight of water with the same volume as the object.
They're not. Weight is the force produced on a mass by gravity. Volume is totally independent.
No; volume and mass are different characteristics with different units of measure.. Mass = Volume x Density
Because density is the relationship between weight and volume. If you're just increasing volume, making the stuff fluffier, then for each unit of volume the weight will be less. Let's say you have a cup of cream. If you turn it into whipped cream it'll still weigh the same, but now it won't fit in the cup any more. More volume, same weight - lower density.
Same weight different volume