Becuase the presure just pushes it up and down so it couldn't boil because it would always be moving
there must be vacuum in the Mercury barometer because if air enters the tube the barmeter would become faulty as air pressure will change.
vacuum is measured in inches of mercury. sea level is zero. water will boil at 212F. as negative pressure or elevation increases the boiling temp. of water decreases. if you had a pressure reading of 29.7 in" of mercury the water will boil at 192F. if you had a pressure reading of 10 in" of mercury water will boil at 32F
If the vacuum pump is on, the water will continue to boil. If the vacuum pump is off as the vessel is sealed, the boiling will stop at a point of equilibrium.
Gasoline will eventually boil under extreme vacuum at any temperature but the problem is trying to pull enough vacuum. During a recent experiment it took about 8 hours to pull enough vacuum to boil it to vacuum, the gasoline was at 72 degrees Fahrenheit. Temperature does play a small role when trying to boil under vacuum, this would be true if just trying to boil under normal atmospheric pressures. We pulled enough vacuum to double what was even in space not an efficient way to vaporize fuel.
Water boils in a vacuum because the surrounding pressure is reduced, allowing the water molecules to move more freely and escape the surface of the liquid as vapor. This lowers the boiling point of water, causing it to evaporate at a lower temperature.
lead
YesThis is because boiling is caused by the liquid water turning to gas which is not influenced directly by other materials. However, once in a vacuum the pressure is so low that the water will boil at much lower temperatures.
Place the container of water in a vacuum & it should start to boil at room temperature.
They change from a liquid to a vapor (gas).
The amount of heat needed to boil water varies with the air pressure. Water in a vacuum will boil at room temperature.
Choose a vacuum pump with a 29.75 hg that makes water boil 1 degree C. The typical boiling point of water is hundred degrees Celsius.
this web page doesnt work that well