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"Cubic feet" is a unit of volume, whereas "feet" is a unit of length. They're completely different units, they're used to describe completely different kinds of quantities, and neither one can be converted to the other one. If you could convert volume units into length units, you'd be able to figure out how many inches of gas you put in your car yesterday.
That depends what aspect of the gas you want to measure: its volume, its pressure, its temperature, its density, etc.
The volume of a gas is the same as the volume of its container.
The volume of gas
"mm" (for 'millimeter') is a unit of length or distance, like a rope or a trip in the car. "ml" (for milliliter) is a unit of capacity or volume of space, like the space in a bottle or a balloon. The two units have different physical dimensions, they're used to measure completely different types of quantities, and neither one can be converted into the other one. If length units could convert into volume units, then you'd be able to calculate how many gallons tall you are, or how many feet of gas it takes to fill your tank.
Volume, Tempature, Pressure
50.0 L si units
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0.0821 L·atm/mol·K -Apex
The ideal gas constant ( R ) with a value of 0.0821 has units of liters·atmospheres per mole·kelvin (L·atm/(mol·K)). This means it describes how much volume one mole of an ideal gas occupies at standard temperature and pressure. The units reflect the relationship between pressure, volume, temperature, and the amount of substance in the ideal gas law equation, ( PV = nRT ).
Density is defined as [(mass)/(volume)] expressed in [gram/cm3] or [kg/m3].The definition is applicable to any homogeneous sample of gas, cheese, lead, rock, pea soup, glass ... anything.
The volume of a gas is totally dependent on the container it is in, gas fills its container completely by its particles spreading out. The volume of the container is the same as volume of the gas inside the container. gasses are most commonly measured in SI units (Liters, mililiters, .....).
Without actually doing your homework for you ... have you noticed that if you multiply pressure by volume you get the exact units used for work?
Normally, gas is measured by volume units. It can be either cubic meters (m^3) or cubic feet (ft^3) or any other volume unit. No mater what is the volume unit, this volume contains a heating value. This heating value is expressed in kWh. You can ask your local gas company how many kWh does a m^3 (or ft^3) of your gas contains. It depends on the type of gas that is distributed in your area.
A million British Thermal Units (mmBTU) is a unit of energy equal to 1,000,000 British Thermal Units (BTU). It is commonly used in the energy industry to express large quantities of energy, such as in natural gas markets.
Pressure, volume and temperature, and moles of gas are the four principal variables to describe a gas (for example, see related questions on Ideal Gas Law and others). The standard units are: Pressure: atmospheres (atm) Volume: liters (L) Temperature: Kelvin (K) Number of moles are measure in, well, moles.