Look at that HOT water!

An investigation in proving a gas law


The different types of gas laws are Boyle's Law, Charles' Law, & Avogadro's Law. In order to prove Charles' law, which is a gas law, you have to prove that the volume of gas is directly proportional to the temperature. The goal of this lab is to prove with an experiment, that exact gas law. To achieve this goal, the time taken to expand the plastic bag corresponding with the temperature of the water will be measured. To make sure it is accurate, the procedures will be repeated thrice. Does the ziploc bag inflate more as the temperature increases?

Safety Procedures

To complete this lab, one must follow these safety procedures.

1. Safety Goggles - to protect the lab experimenter's eyes

2. Apron - to be protected from splashing hot water

3. Gloves - Just incase hands touch hot water


1. Hot Plate

2. Pot

3. 3 Zip-Loc Bags

4. 1500 Milliliters of Water (1.5 Liters)

5. Paper & Pencil or iPad or Computer

6. Sharpie

7. 3 Beakers to separate the water

8. large bowl for all the water at the beginning of the experiment

9. Glass Thermometor

10. Glass Rod


1. Label each ziploc with #1, #2, or #3.

2. Pour 500 milliliters of water into a beaker

3. Pour the beaker, with the exact measurements into the pot of water

4. Put the pot of water on a hot plate with the thermometer in the pot.

5. Put ziploc baggie number 1 into the pot. Turn the hot plate on to the highest setting and time how long it takes for the ziploc bag to inflate.

6. When the baggie has inflated to full capacity, stop the timer and record the times.

7. Wait for 2 minutes for the water to cool some, then with the glove and glass rod pull the baggie out of the pot.

8. Repeat steps 2 through 7 with baggies labeled numbers 2 and 3.