Does water evaporates at 100 degree celsius?

Answer 1

First of all, at the molecular level, whether a substance is in a solid, liquid, or gaseous state does not depend on the "temperature", but on the ENERGY of the individual molecules. At any given time, regardless of the temperature, there will be some molecules that have enough energy to be gaseous, some with just enough energy to be liquid, and some that have so little energy that they are solid. And individual molecules are CONSTANTLY changing between these three states due to random collisions and other events that increase or decrease the energy.

Now, when we say that a significant quantity (more than can be quantified by a simple count of molecules) of a substance is "solid", or "liquid", or "gaseous", it is because, at that temperature and pressure, the VAST MAJORITY of the molecules have an energy level somewhere in the range that determines that state. Obviously, this varies with temperature. But the point is, regardless of temperature, all three states exist simultaneously, though only a small minority of the molecules will exist outside of the majority state.

For the most part, this spontaneous transistion from liquid to gas is unobserved. When a molecule of liquid water collides with another molecule, and gains enough energy to become gaseous, it immediately begins rising to the surface (because it is less dense than liquid water). But, the odds against it reaching the surface, before it loses that extra energy, are very large. So most such molecules don't really "evaporate", in the sense of actually reaching the atmosphere. However, SOME DO. But even once it reaches the atmosphere, it still stands a pretty good chance of losing energy and becoming liquid again. But again, some still make it, all the way up into the atmosphere. And, once it gets up there, the lower pressure makes it much more likely to remain in a gaseous state. Those that make it all the way through to the surface of the water, and all the way up into the atmosphere where they stand a good chance of remaining gaseous, are the ones that you are talking about when you say that water is "evaporating" from a lake or ocean. Even though, in reality, at any given time, there is many, many times more of the water spontaneously changing into a gaseous state.

THE END

Answer 2

Yes, water will begin to evaporate at 100 degrees Celsius, which is the boiling point of water. At this temperature, the water molecules have enough energy to overcome the forces holding them together in the liquid state and transition into the gas phase.

Answer 3

No. Water evaporates at all temperatures. It boils at 100 degrees Celsius. That is the temperature when all the water is converted into steam (water vapor).

Answer 4

Water evaporates at all temperatures. It begins to boil at 100 deg C, and that's where it'll evaporate fastest.