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Gases begin to conduct electricity at low pressure because

1. at low pressures gases turn of plasma
2. colliding electrons can acquire higher kinetic energy due to increased mean free path leading to ionisation of atoms
3. atoms break up into electrons and protons
4. the electrons in atoms can move freely at low pressures

Correct answer: colliding electrons can acquire higher kinetic energy due to increased mean free path leading to ionisation of atoms

Solution

At low pressures, the mean free path of electrons increases, allowing them to gain sufficient kinetic energy between collisions to ionize gas atoms, enabling electrical conduction.

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