The vacuum inside a fluorescent tube

In this video, I dunk a fluorescent tube in an aquarium filled with water and I crack the tiny tube at the end with a pair of pliers. The pressure of the air around us pushes the water up until the pressure in the tube and outside are equalized (in other words, at 1 atm). The amount of space occupied by the gas inside the tube is 5 to 10mL. So, how much was the original pressure in the fluo tube?

Disclaimer : These are my video logs and are intended for others who are interested in chemistry/sciences. Do not attempt these experiments if you are not experienced. If you will, use safety measures and common sense and consider all possible problems that may arise before starting an experiment.

Category:

Science & Technology

Tags:

• fluorescent
• crack
• glass
• vacuum
• mercury