The magazine says it tested 10 insect repellents in an outside laboratory, where volunteers let deer ticks crawl on them and also exposed themselves to mosquitoes. Six of these repellents earned a recommended rating from Consumer Reports. These six repellents, along with their active ingredients and cost, are:
Evaporation vs. Boiling Boiling occurs when the temperature of the liquid is greater than the boiling point of the substance. Evaporation can occur at any temperature.
So, as the fast molecules escape, the temperature of remaining water drops. That's why evaporation cools. See Figure 2, top drawing. Water boils when evaporation occurs throughout the pot â not just on the surface â and forms bubbles that are buoyed to the top where they escape.