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The reason why water expands on freezing is that the water molecules organize themselves into hexagonal crystals which have hollow centers, so they are less densely packed than liquid water molecules are.
Wiki User
∙ 14y ago
Wiki User
∙ 14y agoLiquids expand when heated and contract whencooled
The molecules of water are always moving in a random motion. This is called Brownian motion. The hotter the water is the more they move. Think of a dance floor crowded with people. If they stand still, they can be packed into a pretty small area. The more they move around, the more they bump into each other and they will spread out. This is why water expends when it heats up and contracts when it cools. This is true with most materials. Water, however, is unique. If you cool liquid water below 4 degrees Celsius, it actually begins to expand again. This is what ice floats; it is less dense than liquid water because it expands when it freezes.
Wiki User
∙ 12y agoHeat measures the average molecular motion of the water; as the water cools, the molecules are moving more slowly. When they are moving slowly enough, they will not have enough kinetic energy to resist the attractive forces between molecules, and the molecules will bond to each other, forming a solid. That is what freezing is.
Wiki User
∙ 9y agoThis means when you heat an object it wobbles all over the place pushing near by atoms away causing expansion when it is reversed it is the same
cw: Interestingly, water, when it cools from about 4 Celsius to about 0 Celsius, expands. Most usually, however, hotter stuff takes up more volume.
Wiki User
∙ 16y agoit does this because of something called freeze thaw action.
Wiki User
∙ 12y agoSolids contract when cooled down as their particles are slowing down causing vibration to slow down which in the end they are close together again
Wiki User
∙ 11y agothey expand when heated and contract when cooled
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As water is cooled its density does what until it reaches about 4 C?
As water is cooled its density increases until it reaches about 4 C and then it decreases.
Is Saline a suspension?
that question does not make sense... do you mean are the salts in a saline SOLUTION in suspension? No... they are in solution. If you tried to seperate the salt from the water you could not unless you bolied off the water/cooled it down
Why is 1 meter length kept in 0 degree Celsius?
All metals expand when heated and contract when cooled. It is important, therefore, that the standard metre is kept at some constant temperature. That constant temperature could be any temperature but the triple point of water is a convenient benchmark.
What would happen to the pressure if you cooled down the container?
The pressure inside the container would decrease.
If a tin is filled with hot water and sealed then covered with cold water What causes the tin to become dented?
The outside air pressure dents the tin. The water or air inside a sealed metal container will contract when cooled from the outside (by conduction through the can). When it was sealed, the pressure on the inside was the same as on the outside. But the contraction reduces the pressure on the inside, causing the external air pressure to squeeze the can, and possibly cave it in. This is widely demonstrated in another experiment using dry ice. A sealed gasoline can of about a gallon (4 liters) is placed on a dry-ice bed and cooled until the outside air pressure crushes the can.
Why does metal contract?
Metals, like most solids will contract when cooled. When cooled the atoms or molecules slow down, vibrating less often, causing a smaller average separation between them.
Do metals expand when they are cooled?
No, most substances contract with cooling, only some exotic substances (eg water) expands when cooled.
Why does a gass expand when heated and contract when cooled?
When a gas is heated up, the particles within the gas start to move faster, going farther apart (expansion). When a gas is cooled, the particles slow down and it starts to condense (contract), and if cooled enough, into a liquid.
How does a bar of steel get shorter after it has cooled down?
The bar will contract (get shorter) as it cools down, and expand (get longer) as it is heated up.
What does it mean when water is condensed?
the water vapour is cooled down to create water
When water at 4 degrees Celsius is cooled it does it contract?
No. When water is cooled it contracts up to 4 degrees Celsius and then it begins to expand till 0 degrees Celsius. This is called the anomalous expansion of water.
What objects expands when its cold?
Most substances will contract when the temperature decreases. One well-known exception is water; between 4°C and 0°C it will expand if it is cooled down.
Which 3 solids contract on cooling?
I don't know someone answer me please !
Do all solids contract then cooled?
No
What do most materials do when they are cooled?
Contract.
Does gases contract when heated?
No, gasses expand when heated and contract when cooled.
Do liquides contract when heated?
Liquids expand when heated and contract when cooled.
