The number on the dial describes the air. What actually cooks the food is a combination of that air, the surfaces radiating at it and whatever it is sitting on…
Two facts explain most of this: freezing requires a starting point, and water vapour can turn directly to ice without becoming liquid first. Here are twelve consequences.
1. Freezing Needs…
There is a demonstration that has been used to teach chemistry for well over a century, and it works because a candle is far more complicated than it looks.
The…
There is a recurring result in materials science that is worth stating as a general principle: arrangement frequently matters more than composition.
The lining of certain shells is the standard…
There is a small category of objects that are fully explained by one diagram, and this is one of them.
A vacuum flask is a container inside another container, with…
There is a piece of physics that almost everybody half-knows and that is more interesting stated precisely.
The half-known version is that things fall faster and faster. That is true…