# AACT Member-Only Content

You have to be an AACT member to access this content, but good news: anyone can join!

# Pressure Bottle (1 Favorite)

LAB in Observations, Density, Temperature, Gas Laws, Density, Pressure, Measurements, Matter, Volume, Graphing. Last updated September 6, 2019.

### Summary

In this lab, students determine the relationship between volume and pressure of a gas and its temperature. This lab also addresses the misconception that air does not have mass or density by having students determine the mass and density of air pumped into a bottle.

### Grade Level

High school

### Objectives

By the end of this lesson, students should be able to understand:

- that air has mass and density
- the relationship of pressure and temperature for gases

### Chemistry Topics

This lesson supports students’ understanding of

- Gas laws

- Matter
- Density

### Time

Teacher Preparation: 10 minutes

Lesson: 30–40 minutes

### Materials

- Two 2-L bottles
- One cap for bottle
- One Fizz Keeper

- Two aquarium thermometers
- Balance
- Ruler

### Safety

- When you are done, call the teacher over to release the pressure on the bottle—DO NOT DO IT YOURSELF.
- Always wear safety goggles when working in a chemistry lab.

### Teacher Notes

Flinn includes a lab using the Fizz Keeper to show the relationship between temperature and volume (or pressure) of a gas. I find that my students often think that air has no mass and no density, so I adapted this lab to address that misconception.

### For the Student

### Lesson

**Procedure**

- Obtain two 2-L bottles, each having an aquarium thermometer attached to the side. One bottle has a cap on it and will serve as the control. The second bottle will contain a Fizz-Keeper pump on the top.
- Read the temperature by locating the value that has a light green highlight on it. Record the temperature on the control bottle and pump bottle.
- Find the mass of the bottle with the pump. Record the mass.
- Add the specified number of pumps of air into the pressure bottle. Add air pumps at a regular rate—do not add them too quickly.
- Record the new temperature after each set of pumps.
- After 300 pumps, find and record the mass of the bottle with the pump.

**Results & Observations**

Bottle Pumps | Temperature (degrees Celsius) | Mass (g) | Observations |
---|---|---|---|

Control | |||

Pump Bottle (no pumps) | |||

Pump Bottle (100 Pumps) | |||

Pump Bottle (200 Pumps) | |||

Pumps Bottle (300 Pumps) |

**Analysis**

- Draw a representation of what the particles look like inside the bottle.
- What is the relationship between volume of air in the bottle (number of pumps) and the temperature of the gas?
- Create a line graph to show the relationship between the temperature of the air and the volume of air in the bottle (number of pumps).
- What is the mass of air pumped into the bottle?
- Determine the volume of each pump of air:
- What is the diameter of the shaft of the pump?
- What is the length of the shaft of the pump?
- Using the formula for the volume of a cylinder, estimate the volume of the shaft of the pump (and thus the volume of one pump of air).

- What is the density of the air you pumped into the bottle?

**Conclusion**

Explain the relationship between number of air particles, pressure, and temperature and why you think these relationships exist.