AQA A Level Physics复习笔记6.5.3 Ideal Gas Equation

• An ideal gas is a specific type of gas which:
  • Has molecules with negligible volume
  • Collisions which are elastic
  • Cannot be liquified
  • Has no interactions between the molecules (except during collisions)
  • Obeys the (ideal) gas laws (Boyles law, Charles’ law and Pressure law)

   

• All of these can occur at any temperature or pressure

• The equation of state for an ideal gas (or the ideal gas equation) can be expressed as:

• The ideal gas equation can also be written in the form:

• An ideal gas is therefore defined as:

A gas which obeys the equation of state pV = nRT at all pressures, volumes and temperatures

Step 1: Write down the ideal gas equation

Since the number of moles (n) is required, use the equation:

pV = nRT

Step 2: Rearrange for the number of moles n

Step 3: Substitute in values

V = 8.3 × 103 cm3 = 8.3 × 103 × 10-6 = 8.3 × 10-3 m3

T = 15 °C + 273.15 = 288.15 K