Final answer:
The Hot Filament Ionization Vacuum gauge and the Cold Cathode Ionization vacuum gauge are used to measure gas pressure. The Hot Filament Ionization gauge uses a heated filament to ionize gas molecules, while the Cold Cathode Ionization gauge uses a discharge to create ions for measurement.
Step-by-step explanation:
The Hot Filament Ionization Vacuum gauge and the Cold Cathode Ionization vacuum gauge are both used to measure the pressure of gases in an enclosed system, but they work on different principles. The Hot Filament Ionization gauge uses a heated filament to emit electrons, which ionize the gas molecules. The resulting ions create a current that is measured to calculate the pressure. On the other hand, the Cold Cathode Ionization gauge uses a high electric field to cause a discharge in the gas, creating ions that can be measured to determine the pressure.