Dear Jassper:

Every liquid does evaporate, including any acids (not to mention that molten metals such as extremely hot iron in liquid form would also evaporate if you keep subjecting it to higher temperature).

OK, let's refresh our physics knowledge:

Remember that the statistically average kinetic energy of a molecule or atom is E(K) = (3/2)*(k*T) where k is the Boltzmann constant=1.3806 × 10(-23) m2 kg s-2 K-1, and T is the absolute temperature in Kelvin degree temperature:

T(in Kelvin) = T(in Celsius) + 273.15
= (5/9) * [T(in Fahrenheit) - 32] + 273.15


The higher the absolute temperature T(in Kelvin) is, the higher the kinetic energy. When T reaches some high enough threshold, the molecules or atoms acquire so much kinetic energy that they will be able to break away from their surrounding siblings and jump out in vapor form.

Eric