Liquids generally have lower density as compared to solids . But why ice floats on water ?
Answer:
Ice floats on water :
-A substance floats if it is less dense, or has less mass per unit volume, than other components in a mixture. For example, if you toss a handful of rocks into a bucket of water, the rocks, which are dense compared to the water, will sink. The water, which is less dense than the rocks, will float. Basically, the rocks push the water out of the way, or displace it. For an object to be able to float, it has to displace a weight of fluid equal to its own weight.
Water reaches its maximum density at 4°C (40°F). As it cools further and freezes into ice, it actually becomes less dense. On the other hand, most substances are most dense in their solid (frozen) state than in their liquid state. Water is different because of hydrogen bonding.
A water molecule is made from one oxygen atom and two hydrogen atoms, strongly joined to each other with covalent bonds.
Water molecules are also attracted to each other by weaker chemical bonds (hydrogen bonds) between the positively-charged hydrogen atoms and the negatively-charged oxygen atoms of neighboring water molecules. As water cools below 4°C, the hydrogen bonds adjust to hold the negatively charged oxygen atoms apart. This produces a crystal lattice, which is commonly known as 'ice'.
Ice floats because it is about 9% less dense than liquid water. In other words, ice takes up about 9% more space than water, so a liter of ice weighs less than a liter water. The heavier water displaces the lighter ice, so ice floats to the top. One consequence of this is that lakes and rivers freeze from top to bottom, allowing fish to survive even when the surface of a lake has frozen over. If ice sank, the water would be displaced to the top and exposed to the colder temperature, forcing rivers and lakes to fill with ice and freeze solid.
well thats a good question is beause ice is not perfectley all frozen water there is gaps inbetween which is whare air comes into this causes it to float even thoe it may be heavier and denser its is not complete soild
Because ice has a lower density than water. This is one of the greatest exemptions to the rule, "a substance expands when heated, and contracts when cooled." Water expands as it turns to ice.
Since it expands, it has the same mass (same amount of water particles) occupying a larger volume. Thus, its density decreases.
Hope that helps!
it is not solid nor liquid-- so it floats. may be its a component of gas
Waters maximum density is at about 4 degrees Celsius. Colder than 4 degrees Celsius the beginning crystal formations in the ice actually decrease the density. This is a big reason on why people can't freeze themselves and be reanimated 500 years in the future because all the water in our body (which is something like 79%) crystallizes and destroys your entire body from a cellular level.
As water freezes, it solidifies, trapping pockets of suspended gases (air). the ice has a less dense mass than does the water, so it will float.
You are right: liquids generally DO have a lower density than solids. Water/ice is one of the rare exceptions. Ice has a crystalline hexagonal form that takes up more space than water molecules do. (Interestingly enough, this is the same reason that snowflakes are all six-sided.) Water is actually its densest at 3 degrees Celsius, just above the freezing point. This makes the bottoms of most deep bodies of fresh water (e.g., the Great Lakes) 3 degrees all year round.
Ice is an exception. It has lower density than water.
generally all liquids expands on heating and contracts on cooling. but water is an exception. on cooling it contracts only till 4 degrees. if cooled further it starts expanding. at 0 degrees it forms ice. density of substance decreases when it expends. hence the density of ice is less than liquid water. hence ice floats on water.
It is indirectly related to anomalous expansion of water.
Water expands below 4 degrees celcius whereas other elements contract in cooler temperature. Water then loses it's density because same mass of water is spread over a larger area when expanded..so therefore, according to this theory, ice floats on water having density less than water.
The mass of ice and water are in the ratio 11:12 when in the same size.
Ice is a solid ofcourse but if we look at the structure of ice we will find that it has a cage like structure, containing empty spaces where air is filled in. This reduces the density of ice than water (especially cold water) and it floats on it, either in a partly submerged position (occurs in cold water) or in totally submerged position (occurs in warm water), just below the air water interface. This is because the density of warm water is less than cold water. This is one reason.
The other reason is conferred from the property of anomalous expansion of water. According to this property, density of ice is less than the density of water thereby enabling the ice to float on/in water.
Hope you know the anomalous property of water.I am not explaining it.
Thank you.
Water is not the only substance with this anamolous behaviour. There are some Bismuth alloys which also behave similarly.
In the case of water there is an interesting biological importance. If ice were to be denser, in winter all water bodies (at least the shallower ones) will freeze up completely, killing all aquatic life. It almost as though nature was taking care of these life forms by ensuring that ice floats.
Density of water is maximum at 4'c as the water cools the density of water decreases.Since ice have temprature of -20'c therefore it has less density than water and as rule sunstance habving lower density floats on water thus ice floats on water .
Water bahaves cxactly opposite to other liqiuds. This property is known as "Anamolous Behavior of Water".
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