Metals together with potassium and sodium are highly reactive with air and water. When uncovered to air or moisture, they are able to react vigorously, leading to the formation of oxides or hydroxides and the discharge of flammable hydrogen gasoline.
Paraffin oil, also referred to as mineral oil, is generally used to keep metals like potassium and sodium due to the fact it is an inert substance. It does no longer react with the metals, imparting a defensive barrier that forestalls them from coming into contact with air or moisture.
By storing those reactive metals in paraffin oil, the threat of accidental reactions and ability hazards is minimized. It helps to preserve the metals in a stable country and extend their shelf life. When wished, the paraffin oil can be easily drained or wiped off before the use of the metals.