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2. Magdeburg hemispheres - Wikipedia

   en.wikipedia.org/wiki/Magdeburg_hemispheres

   The Magdeburg hemispheres are a pair of large copper hemispheres with mating rims that were used in a famous 1654 experiment to demonstrate the power of atmospheric pressure. When the rims were sealed with grease and the air was pumped out, the sphere contained a vacuum and could not be pulled apart by teams of horses.

3. Torricelli's experiment - Wikipedia

   en.wikipedia.org/wiki/Torricelli's_experiment

   Torricelli concluded that the mercury fluid in the tube is aided by the atmospheric pressure that is present on the surface of mercury fluid on the dish. He also stated that the changes of liquid level from day to day are caused by the variation of atmospheric pressure. The empty space in the tube is called the Torricellian vacuum. [3] 760 mmHg ...

4. Atmospheric pressure - Wikipedia

   en.wikipedia.org/wiki/Atmospheric_pressure

   Atmospheric pressure, also known as air pressure or barometric pressure (after the barometer), is the pressure within the atmosphere of Earth. The standard atmosphere (symbol: atm) is a unit of pressure defined as 101,325 Pa (1,013.25 hPa ), which is equivalent to 1,013.25 millibars , [ 1 ] 760 mm Hg , 29.9212 inches Hg , or 14.696 psi . [ 2 ]

5. Pressure experiment - Wikipedia

   en.wikipedia.org/wiki/Pressure_experiment

   The equipment used for pressure experiments depends on whether the pressure is to be increased or decreased and by how much. A vacuum pump is used to remove the air out of a vacuum vessel for low-pressure experiments. High-pressures can be created with a piston-cylinder apparatus, up to 5 GPa (50 000 bar) and ~2000 °C. The piston is shifted ...

6. List of experiments in physics - Wikipedia

   en.wikipedia.org/wiki/List_of_experiments_in_physics

   Vacuum relation to atmospheric pressure: 1654 Magdeburg hemispheres: Otto von Guericke: Demonstration Atmospheric pressure: 1675 Rømer's determination of the speed of light: Ole Rømer: Measurement Speed of light: 1752 Kite experiment: Thomas-François Dalibard/Benjamin Franklin: Investigation Lightning: 1790 Pictet's experiment: Marc-Auguste ...

7. Collapsing can - Wikipedia

   en.wikipedia.org/wiki/Collapsing_can

   Collapsing can or can crusher experiment is a demonstration of an aluminum can being crushed by atmospheric pressure. Due to the low pressure inside a can as compared to the pressure outside, the pressure outside exerts a force on the can causing the can to collapse.

8. Heron's fountain - Wikipedia

   en.wikipedia.org/wiki/Heron's_fountain

   Heron's fountain is not a perpetual motion machine. [2] If the nozzle of the spout is narrow, it may play for several minutes, but it eventually comes to a stop. The water coming out of the tube may go higher than the level in any container, but the net flow of water is downward.

9. Barometer - Wikipedia

   en.wikipedia.org/wiki/Barometer

   An altimeter is intended to be used at different levels matching the corresponding atmospheric pressure to the altitude, while a barometer is kept at the same level and measures subtle pressure changes caused by weather and elements of weather. The average atmospheric pressure on the Earth's surface varies between 940 and 1040 hPa (mbar).