Glass ball thermometer has ups and downs

Glass ball thermometer, called Galileo thermometer. The thermometer is different, and use this kind of thermometer is the density difference principle. In short, under a certain temperature, small glass ball's overall density is greater than the transparent liquid density in the tube, it is the buoyancy of transparent liquid is less than its gravity, ball sinking; On the other hand, if the overall density of small glass ball less than transparent liquid density in the tube, it is the buoyancy of transparent liquid is greater than its gravity, small ball float. When the transparent liquid in the tube temperature change, its density will change. So different ball float or sink to a equal position with the surrounding liquid density. If the overall density of control the ball, make the lowest ball row overall density from above, the highest row at the bottom, thus forming temperature scale, used to indicate the temperature. Temperature is generally read from a markings lived in each glass balls on the metal disk. This is good-looking, thermometer readings and fun, is often used as craft ornaments, and use the school teaching. Galileo thermometer glass ball color is gorgeous, even in the big glass tube no color transparent liquid also appears quite mysterious. So, if not carefully break Galileo thermometer, flow of liquid inside have poison? The inside of the liquid kerosene, usually harmless. The bright colors of the balls in general because of blending the pigment. So, even though Galileo thermometer accidentally break, liquid flow, also there is no need to worry.