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.
Evaporation is a cooling process--each molecule lost lowers the energy of the remaining molecules Atmospheric Pressure acts as solid lid to evaporating liquid. Once Evaporation-Condensation Equilibrium is reached, the pressure that the gas exerts over the liquid is the Vapor Pressure of the liquid.