.
Measure,
how much air you can give with one blow:
Breath
as much as you can into the big bottle full of water
Get a 1.5 litre plastic mineralwater
bottle, a big bowl full of water and a tube of 1 metre length (you can
also take a drinking straw with a bendable end).
(How can you
easily show that this "empty" bottle is full of water?)
1. The teacher has closed the
bottle full of water, turned it upwards down, dipped it into the bowl with
water.
2. She screwed off the cap
and 3. put one end of the tube into the bottle neck. (The
water did not flow out!)
Photo: The
child took a deep breath and blew it into the bottle.
How
many litre can you give with one breath?
back.......
.......................................................................................................................last
modification: 21.03.2002