Video 1 (Topic 2)

What is the approximate boiling point of water at sea level under normal conditions?

• 71°C

• 100°C

• 120°C

• 20°C

How does the boiling point of water change at high altitudes compared to sea level?

• It increases due to higher pressure.

• It decreases due to lower pressure.

• It remains the same.

• It depends on the type of cooking pot.

How does a pressure cooker enable food to cook faster?

• By reducing the ambient pressure, lowering the boiling point.

• By increasing the ambient pressure, raising the boiling point.

• By adding special chemicals to the water.

• By using a lid that allows steam to escape freely.

In an experiment, water at 20°C begins to boil when the pressure is reduced to 0.023 bar. What does this demonstrate?

• Water can boil at any temperature.

• Boiling point increases with decreasing pressure.

• Boiling point decreases with decreasing pressure.

• The initial temperature of water does not affect its boiling point.