Lussac's Law

The relationship between pressure and temperature

Joseph Louis Gay-Lussac

Lussac grew up during the French revolution. His life was well because his father was a well to do lawyer but when the country went into civil unrest, his father was put in prison. After this he was accepted into the Ecole Polutechnique, a school designed to create scientific and technical leadership. Later he became a professor at the Ecole Polutechnique. His major interest was in the properties of gases, so he began to make tips in a hydrogen air-balloon to study the properties of gases. in 1808 Lussac announced that he had deduced that gases at a constant temperature and pressure combine in a simple proportion by volume, and that proportion is similar weather it is the products or reactions. This law was called Lussac's Law after Joseph Lusssac.


  • Computer
  • Vernier Computer Interface
  • Logger Pro
  • Vernier Gas Pressure Sensor
  • Vernier Temperature Probe
  • Plastic Tubing with Two Connections
  • Rubber Stopper Assembly
  • 125 mL Erlenmeyer Flask
  • Ring Stand
  • Utility Clamp
  • Hot Plate
  • Four One Liter Beakers
  • Glove or Cloth
  • Ice


  1. Obtain and wear goggles.
  2. Prepare an ice-water bath, a room water bath, and a hot water bath.
  3. Prepare the Temperature Probe and Gas Pressure Sensor for data collection.
  4. Prepare the computer for data collection by opening the file "07 Pressure Temperature" from the Chemistry with Computers folder of Logger Pro
  5. Click "Collect" to begin data collection.
  6. Collect pressure vs. temperature data for your gas sample.
  7. Repeat the Step-9 procedure using both the room-temperature and hot-water baths.
  8. Click "stop" when you have finished collecting data. Turn off the hot plate. Record the pressure and temperature values in your data table, or, if directed by your instructor, print a copy of the table.
  9. Examine your graph pressure vs. temperature (C). In order to determine if the relationship between pressure and temperature is direct or inverse, you must use an absolute temperature scale; that is, a temperature scale whose 0 point corresponds to absolute zero. We will use the Kelvin absolute temperature scale. Instead of manually adding 273 to each of the Celsius temperatures to obtain Kelvin values, you can create a new data column for Kelvin temperature.
  10. Decide if your graph of pressure vs. temperature (K) represents a direct or inverse relationship.
  11. Print a copy of the graph of pressure vs. temperature (K). The regression line should still be displayed on the graph. Enter your name(s) and the number of copies you want to print.

Lab Results

This lab is about seeing the relationship between pressure and temperature. what we should find is that the two are directly related. In other words if pressure went up then the temperature would increase. The same for decreasing, one makes the other do the same.