Rotary evaporators remove volatile solvents from nonvolatile reaction samples through evaporation. The overall solvent removal rate is increased by reducing the pressure and rotating for even heat application to surface area. This is not only the quickest method, but it eliminates the chance of overheating as the solvent is collected into the flask. The rotary evaporators feature adjustable knobs for precise apparatus positioning, rotation speed, and temperature of water bath.