Two weeks ago in the lab, we made a practical which considered on testing the effect of inspired and expired air on different things. This is the entry on the teacher’s blog (http://cadem.cumbresblogs.com/2019/10/21/testing-inspired-and-expired-air-in-the-lab/) and these are my results and analysis.
Blowing onto the thermometer:
The temperature rose from 25 degrees to 30 degrees. This was because of the heat our breath has.
Exhale onto the mirror
A kind of fog was formed in the mirror because of the heat our breath has that leads to the production of a sort of vapor when it gets into contact with an object such as a mirror.
Blow into limewater
The test tube were the lime water was, was filled with a vapor due to the contrast between our breath and a cold surface such as glass.
Blow onto the glowing splint
Unluckily, in my group we didn’t get to blow into the wooden splint so we weren’t able to finish the practical. However I believe that if we had kept on blowing, we would have provided the fire with oxygen so at least a small flame would have been kept glowing.