Order early for pre-holiday delivery. Flinn will be closed December 24th, 2025,
through January 4th, 2026, reopening Monday, January 5th, 2026.
Orders received after 10:30 AM Central Time on Tuesday, December 23rd, 2025,
will ship after we return.

Publication 91501
Price: FREE
Demonstrate the properties of hydrogen gas by collecting the gas in a test tube or graduated cylinder and testing its combustion under different conditions. Is hydrogen more or less dense than air? How does the rate of mixing of hydrogen with air affect the rate of combustion? What are the products of combustion?