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`P = "T" * "k" / "V" `

Enter a value for all fields

The **Combined Gas Law Pressure** calculator computes the pressure of a gas using the combined gas law that relates the product of pressure and volume to temperature of a gas in numerous different units.

**INSTRUCTIONS:** Choose units and enter the following:

**Gas Pressure (P):** The calculator returns the pressure in pascals. However, this can be automatically converted to compatible units via the pull-down menu.

The **Combined Gas Law** associates the pressure, volume, temperature and a constant of a gas, based on a combination of Charles's law, Boyle's law, and Gay-Lussac's law. There is no 'official' founder for this law because it is a consolidation of the three other laws. The combined gas law states the ratio between the pressure-volume product and the temperature of a system remains constant (k). This constancy can be used when comparing different conditions using the same substances. The combined gas law is mathematically expressed as follows:

`(P_i V_i)/(T_i) = (P_(f) V_f)/(T_f) = k`

The Combined Gas Law calculator groups the forms of the Combined Gas Law formula in two ways as follows:

**Pressure**based on known volume, temperature and the combined gas constant.**Volume**based on know pressure, temperature and the combined gas constant.**Temperature**based on known pressure, volume and the combined gas constant.**k gas constant**based on the proportionality of the gas if you know pressure, volume and the temperature for the specific gas.

Since **P•V/T = k**, one can compute the initial (i) and final (f) states using the expanded version of the Combined Gas Law. The **P _{i }• V_{i}/T_{i} = P_{f }• V_{f}/T_{f}** tab allows the user to enter any five of the six values in the formula to compute the remaining one via the Combined Gas Law.

**Final Pressure**based on an initial and final temperature and volume and an initial pressure.**Final Temperature**based on an initial and final pressure and volume and an initial temperature.**Final Volume**based on an initial and final pressure and temperature and an initial volume.