Constant Pressure Concept

Demonstrations in Constant Pressure

Setup: yellow Thermolyne hot plate with beaker of boiling water (left), green glass bottle with deflated pink balloon (center), and 2000 mL beaker of ice water (right)
Safety

Hot and Cold Air Balloon

Demonstrates Charles's Law ( at constant pressure). A balloon on a bottle inflates in boiling water and collapses in ice water, giving students a direct visual of gas volume changing …
Tan liquid nitrogen dewar with warning label, clear glass bowl, inflated dark green balloon, and metal tongs on a green benchtop
Safety

Shrinking Balloon

Students observe Charles's Law ( at constant) as a balloon shrinks dramatically in liquid nitrogen. Comparing balloons filled with air, CO, and helium reveals both the ideal gas relationship and …