An experiment is conducted to estimate the value of absolute zero using Charles's Law. 1. A flask of total internal volume V2=285 cm3V_2 = 285\text{ cm}^3V2=285 cm3 is heated in a hot water bath at a constant temperature of 92 ∘C92\ ^\circ\text{C}92 ∘C with its valve open, allowing the air inside to reach thermal equilibrium. 2. The valve is then closed, trapping the hot air inside. 3. The flask is inverted and placed into a cold water bath at room temperature, 22 ∘C22\ ^\circ\text{C}22 ∘C. 4. The valve is opened under water, and water enters the flask as the air cools. 5. The depth of the flask is adjusted until the water level inside the flask is at the same level as the water in the bath. The valve is then closed, trapping both the air and water inside. 6. The flask is removed, and the volume of water that entered the flask is measured to be V1=55 cm3V_1 = 55\text{ cm}^3V1=55 cm3.
Explain why the depth of the flask must be adjusted so that the water levels inside and outside the flask are equal before closing the valve.
State the volume of the trapped air when: (i) the flask was in the hot water bath at 92 ∘C92\ ^\circ\text{C}92 ∘C, (ii) the flask was in the cold water bath at 22 ∘C22\ ^\circ\text{C}22 ∘C.
Using the values above and Charles's Law, calculate an estimate for the value of absolute zero in ∘C^\circ\text{C}∘C.
