Experiment 1

TEACHERS NOTES Diffusion 1.03

Experiment 1. Discussion answers

1 The corks should effectively prevent any through currents of air, and unless one part of the tube is warmer than another, convection currents should not occur.

2 Ammonia from the more concentrated source will diffuse more rapidly than that from the weak source. This is particularly noticeable in the first 5 minutes. In the final 5 minutes, the rates may be very similar

Figure 1

Cutting wide glass tubing with a hot wire

line scored with glass cutter

12 V supply

d.c. or a.c.

bore out with No.6 borer

remove 10mm from plug

replace plug in hole

pack this hole with cotton wool

Figure 2

Preparing the cork

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