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Because as with any liquid, gas or products that expand with heat. Gas,(by this I assume you mean fuel)expands at moderately low temps. (85-78) You will have more fuel in the tank on a hot day (85-90) than the next morning at say 72 degrees. Gas Volume correction is a means in which to determine several things. 1. It insures that if a station pays for 5000 gallons, the tank gage will validate the delivery + - what the temp of the fuel is before delivery and after delivery. It will show that on a relatively warm day delivery, the actual volume delivered was 4987 gallons. On a cold day delivery the volume will read 5012 gallons. 2. if a cold day delivery was scheduled, and the current reading of the tank at delivery was 4027 gallons of fuel in a 10000 gallon capacity tank, the driver will know that transferring a scheduled 5000 gallon load risks the eventuality that with a rise in the temperature, the tanks will overflow. And finally 3. The pump meters the amount of fuel dispensed according to the ambient temps. It correlates the temp of the fuel and ambient temp to insure that if you, the consumer, paid for 10 gallons of fuel, that you get 10 gallons of fuel with a margin of 9/10th give or take.

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