The temperature decrease occurs because a liquid cools as it evaporates and absorbs heat from the probe. The rate of evaporation of a liquid decreases at lower temperatures. ... Hexane reached a lower minimum temperature than heptane. This means that hexane evaporated more quickly than heptane.

Which solvent evaporates the fastest?

Both acetone and MEK are very strong (high solvent strength) and fast evaporating solvents. Acetone evaporates faster than MEK and, in fact, is the fastest evaporating of all the solvents commonly available to consumers. It is used in many industries as a cleaner and degreaser.

Why does hexane evaporate faster than propanone?

Hexane is a larger, longer-chain molecule so there are more London dispersion forces between n-hexane molecule which outweighs the dipole forces in acetone.