Pressure cookers increase cooking speed by raising the boiling temperature of water above its value at atmospheric pressure. (a) what pressure is necessary to raise the boiling point to 220.0°c? (b) what gauge pressure does this correspond to?

a) 2.32 × 10⁶ pa.

b)

Explanation:

Pressure cooker increase speed of cooking by boiling of water at higher temperature .

a) to raise the boiling point to 220°C the pressure should equal to  

       2.32 × 10⁶ pa.

the value of pressure is found out from the table of temperature, vapor pressure ans saturation vapor density.

b) gauge pressure is calculated by subtracting absolute pressure from the atmospheric pressure.

atmospheric pressure = 1.01 × 10⁵ pa

gauge pressure = absolute pressure - atmospheric pressure