As air is pumped out of the jar, the water begins to boil because "the air pressure in the jar has been lowered until it is equal to the vapor pressure of the water."
The force is applied perpendicular to an object's surface per unit area across which that force is spread is known as pressure. The pressure gauge in relation to the higher pressures would be known as gauge pressure. Pressure is measured in a variety of ways.
Equilibrium or vapor pressure The pressure exerted by a vapor in thermodynamic equilibrium including its condensed phases at a particular temperature in a closed system is known as vapor pressure.
The temperature where the vapor pressure of liquid water matches the ambient pressure is known as the boiling point of water. Because we know that pressure, temperature, as well as temperature, are directly related, water with a high boiling point will have a high boiling point, whereas water with a low boiling point will have a low boiling point.
When we maintain a vacuum (pressure lower than atmospheric pressure), water starts to boil at temperatures below 100 degrees Celsius.
Hence the correct answer will be option 3
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