Gay-Lussac's Law

Camille Ysbrand Period 6

What is Gay-Lussac's Law?

Gay-Lussac's Law describes the relationship between temperature and pressure when volume and mass are held constant. In the following lab the relationship between temperature and pressure was discovered by following a list of procedures to complete the experiment.


  1. Prepare 3 buckets of water: cold, room temperature, warm
  2. Plug in the Gas Pressure Sensor and Temperature Probe into the computer
  3. Attach plastic tubing to the open stem of the Gas Pressure Sensor
  4. Tightly insert a rubber-stopper to a 125 mL flask
  5. Close the 2-way valve of the rubber stopper to keep the air inside the flask
  6. Open the file "07 Pressure-Temperature " from the Chemistry with Computers folder of Loggerpro
  7. Click collect
  8. Place the flask and temperature probe into the cold water bucket, when the temperature and pressure numbers stabilize hit keep
  9. Repeat step 8 for the room temperature and warm water buckets
  10. Click stop when the data is done being collected
  11. Choose new calculated column from the data menu. Enter "Temp Kelvin" for the name, and "T Kelvin" for the short name. The Unit is K.
  12. Type in "273+" then select "Temperature" from the variables list, click done
  13. Select "Temp Kelvin" for the horizontal axis
  14. "Curve fit" and "Autoscale" the graph


During the lab observations concerning pressure and temperature were made. As the temperature of the water the flask was placed in increased, the pressure increased as well.


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Pictured below is a molecular model of the set up for the lab experiment.
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From the results from this lab it can be concluded that as the temperature of the water increased the pressure on the flask increased as well. As the temperature of particles increases so does the kinetic energy, making the particles speed up. When the speed of the particles increase they hit objects with greater force, increasing the amount of pressure exerted on an object. More pressure was exerted on the flask as the temperature increased because the particles hit the flask with more force. Pressure and temperature are directly related and the equation K=P/T represents this relationship.