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Title: Rotary Meter Temperature Compensation
Author: David J. Firth
Source: 1999 Appalachian Gas Measurement Short Course
Year Published: 1999
Abstract: As a child, I visited my Grandmother in Philadelphia. She had a big glass tea kettle. When it was time for tea, she put the kettle on the gas stove I used to watch the water start to bubble. Once it boiled, the water vapor screamed as it flowed out the whistle in the lid. You might have a tea kettle like Grandmas in your kitchen and you might have never given it much thought. However, this simple little bit of household science demonstrates how fluids (liquids or gases) react to changes in temperature. Hold this thought. Well return to it in a little while. Imagine a lump of gas. Form it into a cube one foot on each side if you wish - the mythical cubic foot. If the lump of gas occupies one cubic foot of space at whatever temperature it is right now, the lump of gas will grow in size if you heat it. Imagine that you heat this lump of gas enough to make it expand to 1.5 cubic feet. How much gas do you have now? This is a thck question. You have no more gas than you started with. You have the same number of natural gas molecules - the same amount of chemical energy. Your lump of gas simply takes up more space than it did originally. Just like the water vapor expanding and escaping from Grandmas tea kettle, the natural gas in a gas distribution system will expand to occupy more physical space when heated.

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