mabuhay! I am Justine Aguilar, and today I’ll be performing Laboratory Experiment No. 1: Verification of the Combined Gas Law.
This experiment aims to demonstrate the relationship between pressure, volume, and temperature of a gas — which are the key variables in the Combined Gas Law.
For this experiment, I prepared the following materials:
Balloons
1.5-liter plastic bottles
Hot water (around 70–80 °C)
Ice water with ice cubes
Two basins (for hot and cold baths)
A thermometer
Procedure
First, I partially inflated a balloon—about the size of an orange—and carefully stretched it over the mouth of a 1.5-liter plastic bottle, ensuring that it was sealed tightly.
Next, I recorded the room temperature and noted the approximate size of the balloon.
After that, I placed the bottle in a basin of ice water. I left it for about 2 to 3 minutes and observed any changes in the balloon’s volume. Using a thermometer, I recorded the temperature of the cold bath and estimated the new balloon volume.
Then, I removed the bottle and allowed it to return to room temperature, recording any changes in the balloon’s size.
For the next part, I placed the same bottle in a basin of hot water with a temperature of around 70 to 80 degrees Celsius. After a few minutes, I observed that the balloon expanded. Again, I recorded the temperature and the new volume of the balloon.
To ensure accuracy, I repeated the process for three trials, recording all temperature readings and balloon volumes in a data table.
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