How do you calculate pressure bulb?

To calculate the pressure in a bulb, you typically use the formula derived from the ideal gas law: ( P = \frac{nRT}{V} ), where ( P ) is the pressure, ( n ) is the number of moles of gas, ( R ) is the ideal gas constant, ( T ) is the absolute temperature in Kelvin, and ( V ) is the volume of the bulb. Ensure that all units are consistent, particularly with temperature in Kelvin and volume in liters. If you're measuring a real gas, additional factors may need to be considered for accuracy.