
Sometimes, when we look at a glass of water, there are bubles in the water. What do the bubles? Where are the bubles come from?
If we discuss about pure water, so the glass only consists of water molecules. In this water, sometimes we see bubles. These bubles are water molecules. This is happening, because there is an amount of energy from the environment arround water, absorped by water molecules. The kinetic energy of these molecules are greater than before, they move faster than the others. That is why, there are bubles, because these molecules make holes in the water for their movement. These molecules, at that time, change into a gasous state.
We can conclude that the bubles are water gas in the water liquid. this evident will disappear when the kinetic energy of molecules changes into their basic condition. The water gas changes into water liquid. However, the bubles will appear again sometimes if there is an energy transferred from environment to the system.
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