Which of the following statements about vacuum gauges are correct?
Statement 1: Thermal vacuum gauges sense the cooling effect of a heated filament.
Statement 2: Thermal vacuum gauges designed to measure high pressures.
a) True, False
b) True, True
c) False, True
d) False, False

Answer: a
Explanation: The vacuum gauges designed to measure very low pressures or in a vacuum.The vacuum gauges sense the cooling effect of a heated filament on the gases in the vacuum chamber being measured. It consists of heated thin wire. These resemble as thermal flow meters, where heated wire is placed into the flow steam and infer the flow by measuring the speed with which heat is dissipated. The vacuum gauges sense the cooling effect of a heated filament on the gases in the vacuum chamber being measured.