How to create a simple thermometer? The instrument to teach you

Thermometer, can be said to be more common in our life is also more commonly used items. You use the thermometer were purchased from a variety of sources, actually oneself to make a simple thermometer, can here is to teach you how to create a simple thermometer! First is to prepare production material, to prepare a quadrangular bottle and a cork, a straw, and some adhesive tape, still prepare some colored water. Then there is the official start of the production, the production of colored water first into the quadrangle in the bottle, and then close bottle with a cork. To fortress in a hole in the cork, straw, insert the bottle from the hole have been inserted to the colored water in the bottle. With strip finally sealed bottle. Such a simple thermometer is complete. Done to test the steps, holding the bottle in hand when testing. If discover the water in the straw will increase, making the thermometer is good, the opposite shows that temperature is not successful. Straws in the water column will rise because locked up in the air inside the bottle, as temperatures rise and expansion, its molecular intense collision, and began to oppress level, make water into a straw, so the water column is up. Want to get more accurate temperature, can consult real thermometer, graduated in the bottle, so the simple thermometer can show you the different temperature. Summary the making of the thermometer is made by using the principle of the liquid heat bilges cold shrink. Now, the rapid development of science and technology, all kinds of thermometer was born, but most of the thermometer is still using the medium of the principle of heat bilges cold shrink to create a thermometer. Bimetallic thermometer is so, for example, using two different metal expansion degree during temperature change, the principle of work. Is based on the ring around made of bent bimetallic strip. End is heated expands, turns the pointer, the instrument will show thermoelectric potential should value.