What is the boiling point of water at 085 bar 1 bar and 2 ba

What is the boiling point of water at 0.85 bar, 1 bar, and 2 bar respectively? Interpret the results to elaborate why it takes a) longer to cook meat and potatoes on mountain tops b) shorter time to cook and potatoes in a pressure cooker.

Solution

From the water pressure and boiling point relationship table,

Boiling point of water at 0.85 bar is approx. 95^o C

Boiling point of water at 1 bar is approx. 100^o C

Boiling point of water at 2 bar is approx. 120^o C

a) One mountain top,the atmospheric pressure decreases therefore the boiling point of water decreases. Therefore, the cooking time increases. Therefore, potatoes and meat take longer time to cook.

b) However, in a pressure cooker the pressure is increased, therefore boiling point of water also increases. Due to this the cooking time decreases. Therefore, potatoes and meat take less time to cook.