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Why sodium metal is kept in kerosene?

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Sodium is highly reactive. It reacts with water and oxygen quickly and forms sodium hydroxide and hydrogen gas hence catches fire. To disconnect its contact with air it is kept in kerosene. When a very small pieces of (Na) sodium is dried in a filter paper and then put into a beaker filled with water. It seems that piece of (Na) moves fast as it forms sodium hydroxide and hydrogen reacting with water.

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