The operation of a vacuum drying oven involves substantially lowering the ambient pressure to decrease the boiling point of the liquid in the substance via the use of a vacuum pump. A considerable reduction in boiling point increases the rate of evaporation of the liquid and hence fastens the drying rate of the substance. Moreover, lowering the boiling point indicates that operating temperatures could be much lower as compared to regular air oven. Hence, heat sensitive substances could be dried with minimal effect to their physical or chemical properties. Additionally, lack of air (or oxygen) during the drying process significantly reduces the chances of substance oxidation.