# Combined Gas Law

Combined gas law is the combination of Charles’s law, Boyle’s law, and Gay-Lussac’s law. It states that the ratio between the pressure-volume product and temperature is a constant. In this calculator, the initial and final volume, pressure, temperature can be calculated alternatively with the other known values.

### Calculator of Combined Gas Law

### Formuls of Combined Gas Law

**Gas Equation: P _{i}V_{i}/T_{i} = P_{f}V_{f}/T_{f} **

**where, **

- V
_{i}= Initial Volume, - P
_{i}= Initial Pressure, - T
_{i}= Initial Temperature, - V
_{f}= Final Volume, - P
_{f}= Final Pressure, - T
_{f}= Final Temperature.

### Example of Combined Gas Law

If the initial and final volume is 12, 2, initial and final pressure is 10, 7 and initial temperature is 5,

T_{f} = (T_{i} x P_{f}V_{f}) / P_{i}V_{i}

= (5 x 7 x 2) / (12 x 10)

= 0.58

Hence, final temperature is** 0.58**

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