Pour a the cup of water containing 1 liter in one of the basins.

Step 1

Procedure

Empty the cup containing 150ml of soap into the remaining basin.

Empty the cup containing the 100ml of soap into one basin.

Step 2

Pour in the other cup of water in to the empty basin.

Step 3

Step 4

Step 5

Mix in the liquids in each basin by hand by shaking one hand into each of the basins.

Step 6

Observe the bubbles.