This term means "compacted and heavy";ice is less ____ than liquid water.?
337101
Ice is less compact or less dense than liquid water.
1001328
solid --liquid: melting\nliquid -- solid: freezing\nliquid -- gas: evaporation\ngas -- liquid: condensation\nsolid -- gas: sublimation\ngas -- solid: reverse sublimation
1044414
Other substances that have a solid less dense than their liquid include the elements bismuth, gallium, and germanium.  Bismuth has a liquid density of 10.05g/cm^3, and a solid density of only 9.78g/cm^3.  Gallium has a liquid density of 6.095g/cm^3, but a solid density of 5.91g/cm^3.  Finally, germanium has a liquid density of 5.60g/cm^3 and a solid density of 5.323g/cm^3.\n\nJust for comparison, water has a liquid density of about 1.0g/cm^3 and a solid density of 0.917g/cm^3.\n\nI think I have heard of other materials that also posses this unusual property, but I can't remember them off the top of my head.  I hope this has been helpful.
856161
By unit volume, probably dry cement is heavier. Why? Because rocks are heavier than water.
449704
Water is water. The density of ice water is 1000 kg/m^3. It isn't floating is it? Then it must not be below 1000.
745528
Interesting theory, however water expands when it freezes.  It has no problem melting under pressure.
95239
compressing 2 liters of water into a 1 liter volume\n\nLiquids are not compressible.
474395
one generally uses pure water as a base point. other liquids are typically refrenced as lighter or heavier than water.
426143
Ice floats on water because it is less dense than water.\n\nAs water cools past 5 degrees celsius, the density of the water actually decreases.  Since ice is water molecules at <0 degrees celsius, it is less dense than liquid water ( greater than 0 degrees), so it floats.\n\nfrom a molecular point of view, the H2O molecules in ice is equally spaced apart, whereas H20 in liquid state are able to slide past each other (i.e. closer to each other), so it is more dense than ice.
110828
Archimedes said: When an object is submerged in water, there is a buoyant force upwards on it that is equivalent to the weight of the water displaced. \n\nSo if you have a heavy object underwater, and it is displacing water, its net weight will be less than when it is in air, displacing air, which is much lighter, so has a much smaller buoyant effect.
339248
Due to sublimation, it will weigh slightly less. However, in a closed system (say you sealed the cup in an airtight box and weighed that before and after the ice melted) there would be 0 change in mass due to conservation of mass/energy.
879719
They are actually not similar.\n\nWater, unlike most substances, becomes less dense when it freezes. This is why ice floats and (in a way) one of the properties of water that allows life as we know it to exist.\n\nEvaporation of sea water leaves behind solutes (salt, minerals, etc) that become more concentrated over time, increasing overall density of the water left behind (if it's not replenished with fresh water). This is why you see people float so easily on dead-sea type bodies of water (the Aral Sea, Great Salt Lake, the Dead Sea).
379878
Density is the key property that determines whether or not a substance floats.  Ice floats because it is less dense than liquid water.  Why is ice less dense?  Because the water molecules in ice are arranged in a crystal lattice that spaces the molecules farther apart than when they are in the liquid state.  That is why ice floats.  \n\nBy the way, your initial statement that cold water is heavier than warm water is not exactly worded correctly.  It is more correct to say that cold water is denser than warm water, not heavier.
419356
I will take a stab at it.  I am guessing it is because water has more degrees of freedom.  In the liquid there is also rotational degrees of freedom to absorb energy that the solid ice does not have.\n\nTo Neil, the formulas are for heat capacity and have nothing to do with the way something is heated, only the amount of energy that it takes.\n\nNor does it have anything to do with Newton's law of cooling.
578266
largest with all the ice\n\n2nd largest without all the ice
480166
If you have an equal volume of hot and cold water the cold water will be heavier.  This is because when you heat up a substance it become less dense, and in general when you cool down a substance it becomes more dense.\n\nThe exception to the rule is water though.  Water is most dense at 3 degrees cesius, after that it start to take a crystalin form and when it freezes actualy expands.  \n\nso long as you are not saying that the cold water is 1 degree and the hot water is 3, then the cold water will be heavier\n\n\nBut remeber it is not by much in any case
606548
Absolute zero.  There are ways to keep water from freezing using pressure, motion, impurities, and so forth.