Lusac's Law Lab

by Gerald Maxwell


Gases are made up of molecules that are in constant motion and exert pressure when they collide with the walls of their container. The velocity and the number of collisions of these molecules is affected when the temperature of the gas increases or decreases. In this experiment, the experimenter will study the relationship between the temperature of a gas sample and the pressure it exerts. Using an Erlinmeyer Flask, temperature probe and water at different temperatures, an experimenter will test the difference in pressure at different temperatures.


The experimenter will place an Erlenmeyer flask containing an air sample in water baths of different temperatures. Then pressure will be measured with a Gas Pressure Sensor and temperature will be measured using a Temperature Probe. The constants of the experiment will be volume and gas. Pressure and temperature data will be collected during the experiment and then analyzed. From the data and graph, the experimenter will determine the kind of mathematical relationship that exists between the pressure and absolute temperature of a confined gas. You may also do the extension exercise and use your data to find a value for absolute zero on the Celsius temperature scale.


An increase in Temperature of the water caused an increase in the pressure inside of the Erlinmeyer flask. Which means that the relationship between pressure and temperature is direct.
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In the lab we placed an Erlinmeyer flask in three containers of water that were cold, room temperature, and hot water. We found that by placing the erlinmeyer flask in cold water that the pressure of the oxygen gas in the erlinmeyer flask decreased and then the data was marked. Following that we placed the flask in room temperature water and the pressure increased slightly along with the temperature and the same results followed when the flask was placed in hot water, so it was found that the relationship between temperature and pressure is direct as Gay-Lusac's Law states