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.
In practical terms, density is the weight of a substance for a specific volume. The density of water is roughly 1 gram per milliliter but, this changes with temperature or if there are substances dissolved in it. Ice is less dense than liquid water which is why your ice cubes float in your glass. As ...
Ice floats because it can displace is weight Mg of water without being fully immersed. That's when W = Mg = Rho g u = B and u is the volume of ice under water where u < V and B is called the buoyancy of ice. In case you didn't notice Rho g u = the weight of the water displaced by the ice.
For those of you who didn't get to do the Mass of Ice and Water activity before everything melted - here's the full activity. I'll show you what happened, it's up to you to tell me why.
The density of any substance changes based on temperature. In most cases, the hotter a substance, the less dense. This is not the case with water, due to complex interactions between the positively and negatively charged ends of different water molecules and to the crystalline structure of ice.
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)
About Ice, solid; 1 cubic meter of Ice, solid weighs 919 kilograms [kg] 1 cubic foot of Ice, solid weighs 57.3713 pounds [lbs] Ice, solid weighs 0.919 gram per cubic centimeter or 919 kilogram per cubic meter, i.e. density of ice, solid is equal to 919 kg/m³.
The key difference between water and ice is that the water has no regular arrangement of molecules whereas the ice has a certain crystalline structure.. From the initial stages of the earth’s evolution, water has been a major part of the earth. As for today, water covers more than 70% of the earth’ surface.
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