The cannons from Vasa was salvaged already in the 17th century

 

In a diving bell, there is a pocket of air at the top. This allows the diver to breathe without using oxygen tubes like the ones divers use today. A diving bell would look like the ones pictured above.

The Vasa Museum has a diving bell that you can stand in. You’ll find it at the far end of the museum, on the same floor as the entrance. Once inside the diving bell, it is easy to imagine what it was like for the divers in the cold darkness at the bottom of the sea.

Carry out your own experiment

You’ll need:

  • A bucket
  • A glass jar
  • A tealight
  • A box of matches

This is what you do:

  • Fill the bucket with water
  • Light the tealight and carefully place it on the water’s surface in the bucket.
  • Place the glass jar over the tealight and lower it into the water...

What happens?
How come the tealight keeps burning?
How long does it take before the tealight goes out?
How come the tealight goes out?