Color glass ball Galileo thermometer in the school

Galileo thermometer, refers to the Italian scientist Galileo developed on the basis of the principle of material heat bilges cold shrink tool for measuring temperature, after several improvement become our common temperature measuring device today. And based on the principle of density changing with temperature object designed as this article talked about the stained glass bulb thermometer, also called Galileo thermometer. Now it is mainly used for indoor environment decoration or as a gift, collection, school teaching instrument. Galileo thermometer readings without some professional ball thermometer is accurate, but is very interesting. Careful observation will find that small glass ball up and down in the tube arrangement is regular, the highest temperature drop ball at the top, the lowest in the bottom, and whether or not the ball, or sink or float, both from the top down according to drop temperature descending order. When all balls are still in the glass tube, not up and down, all the floating ball in the bottom of a small ball drop temperature is measured by the current temperature. Sometimes, there will be a central tube still suspended glass ball, then it's drop temperature close to room temperature. But most of the time in the middle of the floating ball is an illusion, because actually the environment temperature change, causing the suspension of the glass ball is slowly float or sink, can make the person think static because too slowly.