Behaviour of gases | Class 9 Physics Formula

Behaviour of gases
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Boyles’ law :

For a fixed mass of gas at a constant temperature,

P1V1= P2V2 = K = constant

Charles’ law :

For a fixed mass of gas at constant pressure,

V_t=V_o({1 \pm {t\over273}})

or  {V_1\over T_1}={V_2\over T_2} = constant (k)

Gay-Lussac’s Law :

For a fixed mass of gas at constant volume,

or {P_1\over T_1}={P_2\over T_2} = constant (k)

The combined form of Boyle’s Law and Charles’ Law :

For a fixed mass of gas when P and T vary,

{P_1V_1\over T_1}={P_2V_2\over T_2} = constant (k)

Equation of state for an ideal gas :

For n mole of an ideal gas, PV = nRT

Relationship between temperature in Celsius and absolute scale :

t°C = (273 +t) K = T K.

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