In general, if ice and water have the same volume, then the ice weighs less. This is because ice is less dense than water and occupies more space. Therefore, a gallon of ice weighs less than a gallon of water. When water freezes into ice, the individual water molecules expand to occupy more space, increasing in volume by about 9 percent.
Ice can be both heavier or lighter or even equal in weight to water. 1 kg of ice will be heavier than 900 g of water, 900 g of ice will be lighter than 1 kg of water and 1kg of ice will be equal in weight to 1kg of water. Now density though is a different matter. Ice has a lower density than water in general. Density is mass per unit volume.
Ice, solid substance volume to weight conversions ... Fiji Pink weighs 1 441.7 kg/m³ or 90.00239 lb/ft³ with specific gravity of 1.4417 relative to pure water. Calculate how much of this gravel is required to attain a specific depth in a cylindrical, ...
Water, ice, and vapor. Within the Earth's atmosphere and surface, the liquid phase is the most common and is the form that is generally denoted by the word "water". The solid phase of water is known as ice and commonly takes the structure of hard, amalgamated crystals, such as ice cubes, or loosely accumulated granular crystals, like snow.
Water's weight, when frozen into ice stays the same, but the density of water is much higher than ice's, since Ice has the same weight and contents of Water, but takes up significantly more space.
In ice, the water molecules gather together and take up far less room, filling in any gaps. So if you have a certain volume of super-compacted water aka ice, and the same volume of regular water, the ice would physical/molecularly take up less room to be the same weight as the original water, making it heavier.
A cubic foot of ice weighs 57.2 pounds, more than 5 pounds less than a cubic foot of water. Unlike most other substances, ice expands as it freezes. Because ice is less dense than water, it floats on the surface of water as it forms. If it became denser, like most other substances, it would sink to the bottom of ponds and lakes.
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I got a little lost in trying to follow which way you were thinking the density change went. Hot water is less dense than cold water. The same number of molecules take up more room when they're hot. Just near the freezing point the pattern reverses, so the densest water is at about 4° C, around 39 °F. Mike W. (published on 07/28/2008)