An explanation please! If ice has a volume greater than water then why would ...?
914417
The real truth is that most of the ice is in glaciers on the land .Antarctica is a land mass,The ice in polar ice on arctic will hardly make any difference,but glaciers in Alaska ,northern Canada Siberia,Iceland and green land will make a lot of difference if they melt all together.That is also the reason that sea level falls when Ice Age comes to Earth.Despite all this Carbon Dioxide talk I believe that Earth is still coming out of ice age and there are so many other factors like Methane gas{Marsh Gas} volcanoes,Sulfur dioxide,and the cycle events in the Sun.It has happened many many times before and will happen again,Let us learn how to live with it.I HOPE IT WILL HELP>DONOT WORRY THE WORLD IS NOT COMING TO AN END,SLEEP TIGHT.
886442
most solids are more dense than the same substance in liquid phase and will sink.  Water/ice is an exception to this rule.
71290
Solid (frozen) water is lighter than liquid water.  Since low density materials float on higher density materials, ice floats on water.  \n\nSolids are typically poor condutors of heat, so ice forms an insulating barrier between the cold air and the warmer water below.  This insulating effect is what keeps lakes from freezing solid.\n\nIf ice was denser than water, ice would sink and liquid water would rise up to contact the freezing air above.  Even the deepest of lakes and rivers would freeze solid.  Life as we know it could not exist over most parts of the earth.\n\nIt is important to remember that most solids are denser than their melted (liquid) forms.  Water is very unique.  Since we cannot imagine life without floating ice, scientists are looking for water in the cosmos as signs of places that we, or other beings might be able to inhabit.
706444
Density= Mass/Volume.  When water freezes, its volume increases. This is why a frozen bottle of water expands to the point of bursting. By the formula, if volume increases and Mass stays the same, then the value of density decreases.  Thus, this is why ice floats and is less dense than water.  When the ice melts, the reverse happens in that its volume decreases and again by the formula, density will increase.   Tahdaaaa!!
131245
It DOESN'T! The ice makes room for itself when the glass fills with water. Melted ice takes up less room that solid. So when it melts, the volume in the glass is the same.
314279
The reason that water expands upon freezing is because of the strong hydrogen bonding between the water molecules. Water is polar having a positive end nearest the Hydrogens and a negative end nearest the Oxygen atom. Therefore The positive ends of some water molecules attract the negative ends of other water molecules. When water reaches 4 degrees Celsius the molecules have been pushed as close to one another as they will be. Below 4 degrees the water molecules begin to align themselves into the crystal structure of ice. This requires the water molecules to widen the angle between the Oxygen Hydrogen single bonds . When this happens the water molecules take up more space hence expansion.
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.
121124
For most substances, the solid form is denser than the liquid form.  Water is special in that the solid (ice) is less dense than liquid water due to the irregular shape of the crystal, due to the bent shape of the molecule.  THis makes it so that the ice floats on top of the lake, rather than sinking to the bottom.  In this way, the ice actually serve to insulate the lake and prevent the lake from freezing entirely, making the flora and fauna beneath able to survive the winter.
1144492
there is no change in the water level\nwhen ice is placed in water, about nine tenths of it is immersed under water\nwhen it melts, the volume of the ice cube decreases as it changes into water, having higher density, and this decrease corresponds to the part of the ice cube, which is above the water level\nhence the level of the water remains same
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.
583824
ice has less density than water.  the H2O bonds in ice are in a crystal lattice structure and there are small bits of air trapped between them.
337101
Ice is less compact or less dense than liquid 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.
1096857
I think it would be easier for ice to return to liquid form since they are more "condense" than the steam which can be any where in space.\n\nbtw lol @ vegasbill1963
557600
Water is one of the few substances that expands as it freezes.  From 4 degrees Celsius down to 0 degrees water expands and as a result the frozen solid form is less dense than the liquid form and that is why ice floats.\nThe water in the soft drink expands and the can cannot hold the increase in volume.
527105
Water when frozen, expands.  it is less dense. so it floats on water which is more dense.
507086
Because water is most dense at 39 deg. F, therefore ice is lighter than water.