The purpose of a gas meter is to monitor how much gas a particular house is using. Customers are then billed according to how much gas they have used from the meter.
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The purpose of a flow meter is to measure the flow of either air or water. They allow one to measure the total volume of air or liquid flow and the rate of the flow.
A meter is a mechanical or digital machine to register something: gas meter, electricity meter, are two examples. A meter (US spelling) or metre (UK spelling) is a measure of linear length.
You multiply the volume of the gas by its density. The volume will depend on the specific gas, and on the pressure and temperature of the gas. As an example, a cubic meter of air has a mass of approximately 1.2 kg/m3. For other gases, the numbers may be quite different.
That depends on the pressure and temperature of the air in the cubic meter. Any time you change the pressure or the temperature of a gas, you change the number of molecules in one cubic meter of it.
A fridge with a freezer on top or bottom (that kind of fridge) is, on average, just a few inches under 1 meter. The average gas stove is about 36 inches wide, a few inches under a meter. Twin beds are 39" wide in America and Canada, a third of an inch under a meter.