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how water works - thin polyester film

by:Cailong     2019-07-10
how water works  -  thin polyester film
The nature of water the hydrogen bonds between the water molecules we talked about in the first part are two unique properties of water: the reasons behind cohesion and adhesion.
Cohesion means that water is easily glued to itself.
Adhesion means that water is also very adhesive to other things, which is why it spreads in the form of a film on certain surfaces, such as glass.
When water is in contact with these surfaces, the adhesive is stronger than cohesive.
Instead of sticking together in a ball, it spreads outward.
The surface tension of water is also high.
This means that the molecules on the water are not surrounded by similar molecules, so they are only attracted by the cohesiveness of other molecules inside.
These molecules bind closely to each other, but are weakly attached to another medium.
An example of this is the way water beads are on a wax-like surface, such as leaves or waxed cars.
The surface tension makes these drops round, thus covering the surface area as small as possible.
Capillary action is also the result of surface tension.
As we mentioned, this happens when the plant "absorbs" water.
The water is attached to the inside of the tube of the plant, but the surface tension is trying to flatten it.
This makes the water rise again and gather together, and the process continues until there is enough water to build up so that gravity begins to pull it down.
The hydrogen bond of water is also the reason why its solid form ice can float in liquid form.
Ice is lower than water density because water molecules form crystal structures when frozen (
32 degrees Fahrenheit or 0 degrees Celsius)temperatures.
The thermal properties of water are also related to its hydrogen bonds.
The water has a very high specific heat capacity, which is the unit mass heat required to increase the temperature by one degree Celsius.
The energy required to increase the water temperature by 1 degree Celsius is 4.
2 Joules per gram.
Water also has a high amount of steam heat, which means that it can absorb a lot of heat without a significant increase in temperature.
This plays a huge role in the climate, because it means that it will take a long time for the ocean to warm up.
Water is often referred to as a general solvent, which means that many substances are dissolved in water.
Substances dissolved in water are hydrophilic.
This means that they are as strong or stronger as the cohesion of the water.
Both salt and sugar are polar like water, so they dissolve well in it.
A substance that is not soluble in water is hydrophobic.
This is the source of the phrase "oil and water are not mixed.
"The solvency of water is the reason why we use very little pure water;
It usually has several minerals dissolved in it.
The presence of these minerals is the difference between hard water and soft water.
Hard water usually contains a lot of calcium, magnesium, but it may also contain metal.
Soap does not bubble in hard water, but hard water is usually not dangerous.
It also causes lime scale deposits in pipes, water heaters and toilets.
Some of the latest controversy about the properties of water is the behavior of the ice when it melts.
Some scientists claim that it looks roughly the same as when it was solid, except that some of its hydrogen atoms break.
Others think it's a whole new structure.
Therefore, although water is important, we still cannot fully understand it.
For more information on water and related topics, please see the link below.
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