The key difference between the two is the temperature at which the liquid changes to a gas.

* Evaporation occurs when the temperature of a liquid is below its boiling point. The molecules of the liquid gain energy from the surrounding environment and escape from the surface of the liquid to become a gas.

* Boiling occurs when the temperature of a liquid reaches its boiling point. At this temperature, the molecules of the liquid have enough energy to escape from the surface of the liquid and from within the liquid itself to become a gas.

Another difference between boiling and evaporation is the rate at which the liquid turns into a gas.

* Evaporation is a slow process, while boiling is a rapid process. This is because evaporation occurs only at the surface of the liquid, while boiling occurs throughout the liquid.

Finally, the boiling point of a liquid depends on the pressure of the liquid.

* The higher the pressure, the higher the boiling point of the liquid. This is because the pressure of the liquid prevents the molecules of the liquid from escaping from the surface of the liquid.

In summary, boiling and evaporation are both processes in which a liquid turns into a gas. The key difference between the two is the temperature at which the liquid changes to a gas.