This laboratory session is centered on the measurement of gas pressure using a pressure gauge. The procedure involves sequentially connecting the pressure gauge to various gas cylinders (referred to as “candies” in this context), then opening the cylinder valve to allow the gas to flow into the pressure gauge. By observing the movement of the pressure gauge needle, the pressure of the gas within each cylinder can be determined. After recording the pressure measurement, the cylinder valve is closed, and the pressure gauge is disconnected.
This process is repeated for each cylinder to be tested. The primary aim of this laboratory is to acquaint students with the practical use of a pressure gauge for measuring gas pressure and to enhance their skills in handling and manipulating laboratory equipment.
Educational Goals
- Understanding Gas Pressure Measurement: Participants will learn the principles of measuring gas pressure using a pressure gauge, focusing on the operational aspects of the equipment.
- Equipment Manipulation Techniques: The session aims to develop proficiency in the safe and effective manipulation of laboratory equipment, including the proper connection, operation, and disconnection of a pressure gauge to gas cylinders.
- Observational Skills: Enhance students’ ability to accurately observe and interpret the readings of a pressure gauge, vital for determining gas pressure within cylinders.
- Safety and Precision: Emphasize the importance of safety precautions and precision in conducting experiments involving gas pressure measurements, reinforcing best practices in laboratory procedures.
By engaging in this laboratory, students will gain hands-on experience with measuring gas pressure using a pressure gauge, from setting up the equipment to interpreting and recording pressure readings. This session not only teaches the technical aspects of using a pressure gauge but also reinforces the importance of methodical equipment manipulation and safety in the laboratory. Through this practical exploration, students will enhance their understanding of gas behavior under pressure and acquire essential skills in conducting physical science experiments.
Protocol
Measuring the pressure of a gas
To measure the pressure of a gas, we can use a manometer.
1) Connect the manometer to the hose of cylinder #1.
2) Open the valve of the cylinder.
3) Check the manometer needle to determine the pressure of the contained gas.
4) Close the valve of the cylinder.
5) Detach the hose from the manometer.
6) Repeat the procedures for the other 3 cylinders.
Anticipated Outcomes
- The air canister #1 contains 280 kPa of air.
- The air canister #2 contains 345 kPa of air.
- The air canister #3 contains 460 kPa of air.
- The air canister #4 contains 130 kPa of air.
Significance and lessons learned:
- Conceptual understanding: The experiment aids in understanding the concept of pressure and how it is measured, providing a practical application of theoretical knowledge.
- Technical skills: Handling gas cylinders and manometers develops technical competency, critical for students and professionals in scientific fields.
- Safety awareness: The emphasis on safety protocols reinforces the importance of caution and preparedness in a laboratory, skills that are transferable to any scientific endeavor.
- Analytical skills: Interpreting the manometer readings to determine gas pressure fosters analytical thinking, an invaluable skill in problem-solving and research.
In essence, this experiment is not merely about reading numbers of a device; it’s about integrating knowledge, developing practical skills, and fostering a meticulous approach to scientific investigation. Participants learn to correlate the observed manometer readings with the known pressures in the gas cylinders, providing a clear, hands-on understanding of pressure measurement in gases.
Summary of Assignment by Grade Range
Grades 3-5 (Ages 8-10)
- Focus: Basic introduction to gas pressure concepts and simple measurements.
- Activities: Observing the use of a pressure gauge, simple demonstrations of gas pressure, basic safety instructions.
Grades 6-8 (Ages 11-13)
- Focus: Intermediate understanding of gas pressure measurement and equipment handling.
- Activities: Connecting a pressure gauge to gas cylinders, measuring and recording gas pressure, observing needle movement, following detailed safety protocols.
Grades 9-12 (Ages 14-18)
- Focus: Advanced understanding of gas pressure principles, precise measurement techniques, and equipment manipulation.
- Activities: Accurately connecting and operating a pressure gauge, measuring and recording gas pressures from various cylinders, analyzing pressure readings, adhering to advanced safety protocols, and ensuring precise handling of laboratory equipment.
Laboratory essentials
Instruments
Gas tank
Manometer
Products