Gas Jar including Glass Cover

A gas collecting jar with glass cover is a cylindrical glass vessel used for collecting, storing, and observing gases. It is specifically designed for gas collection by water displacement or air displacement

Key Features

• Material: High-quality soda-lime glass, providing clarity and chemical resistance.
• Design Features:
• Ground Flange: The top rim is finely ground to ensure a gas-tight seal when used with the matching cover plate.
• Heavy Foot/Base: Most models feature a wide, weighted base to prevent tipping during experiments.
• Cover Plate: Supplied with a matching ground-glass cover (lid) that prevents gas leakage and contamination

Safety and Handling 

• Density Considerations: If the collected gas is denser than air (like CO²), the jar is stored upright with the cover on top. If the gas is lighter than air (like H²), the jar is stored inverted to prevent the gas from leaking out through the lid.
• Not for Heating: Most standard school gas jars are made of soda-lime glass and should not be heated directly over a flame or hot plate, as they may crack.

 Primary Uses in School Experiments

• Gas Collection by Displacement: Jars are commonly used with a beehive shelf in a water trough. As gas is produced, it bubbles into the water-filled, inverted jar, displacing the water downward until the jar is full.
• Testing Gas Properties: Once a gas is collected, the glass cover prevents it from escaping via diffusion. Students then perform standard "gas tests," such as:
• Oxygen: Inserting a glowing splint to see if it relights.
• Hydrogen: Performing the "squeaky pop" test with a lit splint.
• Carbon Dioxide: Adding limewater to the jar and shaking it to see if the liquid turns milky.