Which is less the density of liquid water or an ice cube?
402591
The short answer is an ice cube, but that is not the whole story.  Water reaches its maximum density at about 4 degrees centigrade at which point it is still liquid.  The density drops at temperatures below 4 degrees, ice forms at 0 degrees and the density continues to drop as things get cooler.  The density also drops as water is heated.\n\nSo at 60 degrees centigrade, liquid water has a density of about 983kg/m3 while at -10 degrees, ice has a density of 998kg/m3.  This means the ice more dense than the water, so if you drop an ice cube at -10 into a cup of water at 60, the ice cube will sink (if you can stop it from melting or cooling the water).\n\nAssuming your teacher asked you this, you can put their nose out of joint by telling them ice is more dense than water and when they contradict you ask them to calculate the density at the temperatures I gave and tell them to ask more precise questions next time.
527105
Water when frozen, expands.  it is less dense. so it floats on water which is more dense.
786403
a) a lower freezing point than pure water
597803
D) It's heat of fusion is higher than its heat of vaporization.\n\nWater's heat of fusion is: 334.5 kJ/kg\nWater's heat of vaporization is: 2256 kJ/kg\n\n\nE IS NOT CORRECT BECAUSE: Water is denser than ice. If water was not denser than ice, ice would not float.\n\nAnd Mr. the_bendude, you must have never taken chemistry. Heat is not the same as temperature. Yes, water boils at 100C and freezes at 0C, but that does not mean those are the heats for which it does.
663824
it lowers the freezing point of water, make it more dense, so it has to e colder for water to freeze
294040
Things float as long as the water they displace (move out of the way) weighs as much as they do. Whether that happens depends on the density of the thing. The density of an object is equal to its weight divided by its volume. Every substance, including water, has its own density at a given temperature (density can vary as a substance gets hotter or colder). Any substance that is less dense than water floats while one that is more dense sinks. However, even though cargo ships hold a ton of heavy cargo, they have chambers of air inside that make them mostly hollow. This brings me to the main point... an object that is hollow like a cargo ship floats if its density-its weight divided by its total volume is less than the density of water.
251316
It expands.  \n\nHere's an interesting point... becauase it expands, the same molecules of water take up more space as a solid than as a liquid, so it's less dense.  If it contracted (like most other things do when they go from liquid to solid) it would take up less space and be more dense... so frozen water would be heavier than liquid water.  If that were the case, ice would sink, which would be a serious bummer for fish.  As it is, since water expands, solid water (ice) is lighter than liquid water, so it floats - a serious bummer for the Titanic, but a good thing for cold drinks and fishies.\n\nI love this stuff.
273941
to take grandeyeglass's link one level further,\nhttp://www.lsbu.ac.uk/water/phase.html\nWould be nice to get this chart overlayed with adiabatic and iso-volumetric contours.\n\nSo the answer is YES there are pressure/temp regions where the only difference between liquid and solid is purely pressure.\n\nAt a temperature of -10C, and a pressure of 200MPa, H2O is liquid. But if you increase the pressure to 450MPa, H2O solidifies to ice-V with a density of 1.23 g/cc. Also, amazingly, if you decrease the pressure from 200 to 100MPa, it solidifies to ice-Ih with a density of 0.92 g/cc.\n\nAt room temp (20C) you have to increase the pressure to 900MPa to solidify it to ice-VI with a density of 1.31 g/cc.\n\nH2O is amazing stuff... I have learnt something here...
916456
The density of water goes down when it is frozen and down when it is heated, so I would say just above freezing.  According to the website, about 4 degrees C.  The density of water at this temperature is 1.000g/cm3
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.
337101
Ice is less compact or less dense than liquid water.
279658
Ice floats on water because it is less dense than water, meaning it has fewer molecules per volume. This is because of the Hydrogen bonds. In fact, while other substances contract when solidified, water expands. That's why it's less dense, and not because it has air inside. Furthermore, when the temperature decreases and reaches 4 degrees Celsius, every water molecule is Hydrogen-bonded to 4 other molecules near it. Then, they form into a crystal lattice structure, and it holds them further apart.
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
782227
Density is a measure of mass per volume. Same amount of water; sugar water is denser. Weigh; salt is NaCl, sugar is a more complex and heavier molecule. Formula for glucose. C6 H12 O6. Denser.\n\nNo. sugar water is denser than salt water. Period.
312206
Water continues to become more dense as it cools until just above the freezing point.  I can't remember the exact temperature off-hand, but I believe it is very near 33.5 to 34 degrees Fahrenheit.  \n\nBelow that water begins to expand and once it has frozen, its volume increases approximately 10%...that's why ice floats...less dense than the water it came from!  Cool, huh?
859051
water has density 1gm/ml. what ever is the volume in ml for water same is the mass in gms because density = mass/volume\n\n\ni hope it will help you out
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.