This time I had to put water into a plastic container, weigh it and mark the height of the water and freeze it overnight. The next morning the water was frozen and still weighed the same (good). But the ice still seemed level with the mark I had made ie it had not expanded as it should have (bad).
The rest of the course is interesting and not, on the whole, difficult. I either never knew, or had forgotten, that there is a 'triple point' where water can exist simultaneously as ice, liquid and gas (steam).
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