a) Gas Cylinders: Ethylene is available in large steel cylinders where it is stored under pressure. As it is highly flammable, the use of pure gas is discouraged. Therefore, it is usually used diluted with nitrogen or other inert gases. Typical mixtures are 95 per cent nitrogen and 5 per cent ethylene or 95.5 per cent nitrogen and 4.5 per cent ethylene. The measured quantities of ethylene are introduced in ripening room at regular intervals or continuously and the flow is regulated through metering devise or flow meter. Any piping leading into the ripening room should be grounded to prevent possible electrostatic ignition of ethylene gas.