Air spray

摘要

I wanted to chill a mug of water so placed it in the freezer, but then forgot about it and it froze solid. When I removed the block of ice from the mug it contained the most amazing thistle-like pattern of what seemed like canals of air (see photo). None of these canals extended to any outside surfaces. What happened? 1. The simple answer is that because you live in Somerset West, South Africa, you should ask your neighbour Jon Richfield, who answers so many of the questions on this page.