# Pressure Law - question about experiment apparatus

• slakedlime
In summary, the experiment apparatus used to verify the Pressure Law includes a short length of rubber tubing connecting the flask to the pressure gauge. This is important because the air in the tubing is not uniformly heated and can affect the accuracy of the pressure reading. Additionally, the air in the tubing can cool down before reaching the pressure gauge, further impacting the results.
slakedlime
[SOLVED] Pressure Law - question about experiment apparatus

Introduction
Above is a diagram representing the apparatus which can be used to perform the experiment which verifies the Pressure Law (i.e. pressure is directly proportional to temperature for a fixed mass and volume of gas).

The question
Why is it important to use a short length of rubber tubing to connect the flask to the pressure gauge?

The attempt at a solution Here is my hypothesis:
The rubber tubing contains a volume of air which is not accounted for in the experiment (the volume of air being restricted only to that in the flask). Air is a poor conductor of heat energy so the air in the tubing is not uniformly heated when the air in the flask is. The air in the tubing is denser than that in the flask. Thus when the flask is heated, the actual volume of the air decreases as some escapes into the tube. Consequently, a wrong pressure reading is given.

Correct - there is also the effect of the air cooling down a long tube before it reaches the pressure gauge

Last edited:
Thank you for your help and input.

## 1. What is the purpose of the experiment apparatus used in the Pressure Law experiment?

The experiment apparatus is used to demonstrate the relationship between pressure and volume of a gas at constant temperature.

## 2. What are the main components of the experiment apparatus?

The main components of the experiment apparatus include a gas syringe, a pressure gauge, and a volume scale.

## 3. How does the experiment apparatus work?

The experiment apparatus works by measuring the volume of gas in the gas syringe and the corresponding pressure on the pressure gauge. As the volume of gas is decreased, the pressure increases, demonstrating the inverse relationship between pressure and volume in accordance with the Pressure Law.

## 4. What are the potential sources of error in this experiment?

Potential sources of error in this experiment include air leaks in the apparatus, inaccuracies in measuring the volume of gas, and variations in temperature which can affect the pressure of the gas.

## 5. How can the results of this experiment be applied in real-world situations?

The Pressure Law has many practical applications, such as in scuba diving, where changes in pressure affect the volume of air in a diver's tank, and in the design of aerosol cans, where pressure and volume must be carefully controlled to ensure proper functioning.

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