It measures how far Greek people's eye brows are apart, hence the name theo, meaning most-wog in ancient Greek.
on his honeymoon in switzerland he got a theometer and measured the bottom of the waterfall and then the top and he said that kinetic energy is transferred into heat energy i think, our science teacher asked us to google the same thing so improve this answer if youu can.
If you are on about the theometer at the left hand side of the aspiration meter then it means your sim is to hot: Red/ orange - Your sim is to hot go cool them off with a swim Green - Their temperature is fine Blue - They are to cold , warm them up by a cosy fire! I hope that helped you ! Happy simming !