In steam distillation, water or steam is added to the still pot and the oils are co-distilled with the steam. The oil is separated from the water by means of a Florentine flask, which separates them based on their differing densities. The presence of water in the pot during steam distillation limits the temperature of the process to 100°C. This means that much less degradation occurs in this process than dry distillation. However, some degradation does occur. For example, tertiary alcohols present in the plant often dehydrate in the pot and distil as the corresponding hydrocarbons