Question: Indicate the false option about vacuum gauges: 1 . Some vacuum gauges are based on the application of the Boyle - Mariotte law. 2 .

Indicate the false option about vacuum gauges:
1. Some vacuum gauges are based on the application of the Boyle-Mariotte law.
2. Some vacuum gauges are based on the fact that the heat conductivity of a gas decreases as it becomes rarefied.
3. The pressure of a gas can be measured by ionizing its molecules.
4. Ion discharge tubes are the devices that measure pressure with the least error.

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