I think logically, because its volume doesn't expand much when it heats up. If I take a pan of melted chocolate, and let it go cold and solidify, it won't take up appreciably less space, and it will still weigh the same amount... still have the same mass.
I recall that water is a bit of an exception though, and it's maximum density (ie. it's heaviness by volume) is at 4 degrees. That should mean if you take a jug of water, which is ready to overflow at 4 degrees, it will already be spilling over if you warm it a bit or freeze it.
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A liquid is nearly as heavy as a solid because the particles in a liquid are still close together and have some level of structure, giving them density and weight. While the particles in a liquid can move past one another unlike in a solid, they still have mass and take up space, which contributes to their weight.
Whether the solid will float or sink in a solid-liquid mixture depends on the relative densities of the solid and the liquid. If the density of the solid is greater than that of the liquid, then the solid will sink. If the density of the solid is less than that of the liquid, then the solid will float.
Sand is a solid, not a liquid.
Sand is a solid, not a liquid.
Solid to liquid is known as melting, where a solid substance transitions into a liquid state by absorbing heat energy. Liquid to solid is known as freezing, where a liquid substance transitions into a solid state by releasing heat energy.
There are three basic states of matter: solid, liquid, and gas. The number of combinations possible from these states is 3! (3 factorial), which equals 6. The six possible combinations are solid-liquid-gas, solid-gas-liquid, liquid-solid-gas, liquid-gas-solid, gas-solid-liquid, and gas-liquid-solid.