No. Perpetual motion is not possible.mcmpw said:
About 10 metres above the spillway of the catch tank. That is the height of a water-filled barometer, a column of water supported by atmospheric pressure with a near vacuum of water vapour above.mcmpw said:
PF Forbidden Topics said:
A Torricellian vacuum is a type of vacuum created by filling a tube with mercury and then inverting it into a dish of mercury. The space above the mercury in the tube is a near-perfect vacuum, named after Evangelista Torricelli, who first created this type of vacuum in 1644.
A Torricellian vacuum demonstrates atmospheric pressure because the height of the mercury column is directly related to the atmospheric pressure exerted on the mercury in the dish. The higher the atmospheric pressure, the higher the mercury column will rise in the tube.
Torricellian vacuums are primarily used in barometers to measure atmospheric pressure. They are also used in scientific experiments to study the properties of vacuums and the behavior of gases under reduced pressure.
Mercury is used because of its high density, which allows for a manageable column height to measure atmospheric pressure. Other liquids would require much taller columns to achieve the same effect, making them impractical for everyday use.
Yes, other liquids can be used to create a similar vacuum, but they would require much taller columns due to their lower densities. For example, water would need a column over 10 meters high to achieve the same pressure measurement as a mercury column of about 76 centimeters.