- The fastest moving molecules (those with the highest kinetic energy) at the surface of the liquid have enough energy to break the attractive bonds with other molecules. They then escape the surface of the substance. Obviously, this only occurs with the molecules at the surface of the substance.
- Since at higher temperatures the molecules have more kinetic energy, more of them are likely to escape, and so evaporation occurs more quickly at higher temperatures.
- In general, evaporation occurs because systems seek equilibrium (there is a low concentration of molecules in the air, and a high concentration in the liquid).
What causes water evaporation?
Water evaporates when the light from the sun hits it, what happens next is the energy from the sun's light causes the molecules of water to push away from one another. Like putting two north ends of a magnet against each other, they push away. The molecules of water that have split from the sun's energy change from a liquid state, to a gaseous state, the gas then rises into the Atmosphere where is cools down, or loses a bit of it's energy and start to become attracted to other airborne H2O molecules.
What is a liquid pool cover?
A liquid pool cover is a silicone based product that seals in pool water without the need for a roller or bulky solid pool cover. A I have been researching all sites are saying that liquid pool covers prevent almost all evaporation compared to normal solid pool covers, (however I will be seeing if this is true in my actual SRP experiment). 
Ok so while I was researching liquid pool covers, I came across these pictures on a site (btw speaking of site, I will reference them al at once) promoting their liquid pool cover called, "Heatsavr". The picture on the left shows a pool without the liquid pool cover- Heatsavr, so you can see evaporation from the pool. The picture on the right shows a pool with the liquid pool cover- Heatsavr, where you can't see any evaporation. So these pictures are showing the differences in level of evaporation with or without the liquid pool cover.
What is a solid pool cover?
I have been looking at solar pool covers, these are solid. A solar pool cover gives the pool free heat from the sun. They are somewhat similar to bubble wrap, except of course made with more durable material. In fact a solar pool cover can raise the temperature in your pool from around ten to fifteen degrees celsius. But not only are they a heating mechanism, they can slow down evaporation rates in your pool, therefore lowering costs. As much as 70% of heat loss from a swimming pool is evaporative. A solar solid pool cover acts as a vapor barrier for both indoor and outdoor pools, dramatically cutting heat losses from evaporation, resulting in significant energy savings.
ok so this is just a picture of a sample of a solid pool cover. It is very similar to the actual one I am going to use.
Which type of cover is better in terms of evaporation?
Well generally speaking, all covers have their own separate advantages, for example, solid pool cover can keep out dust, dirt, leaves and debris, where as a liquid cover can't. Or a liquid pool cover looks nicer and you can dive into the pool at any time without having to worry about putting the cover on and off again. In terms of evaporation, different brand of pool covers claim different things. I guess I will just find out for sure from my experiment... :)
But just for now, I believe that theglass with plain water will evaporate the fastest, followed by the glass with chlorinated water and no cover, followed by the glass with the chlorinate water and liquid pool cover and finally the glass with the chlorinated water and the solid pool cover.
I am very interested to see especially between the last 2 glasses, in which one the water will evaporate the fastest. :)
ps. sorry for the long post! and sorry for the really weird spacing, whenever I insert pictures it stuffs up the spacing!
xoxo Mira
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