OCR Text |
Show A New Way of Boiling Water. It is possible to make a pall of -water boil without putting it on the fire or applying external heat to it in any way. In fact, you can make a pail of water boil by simply stirring it with a big wooden spoon. All you hava to do is to place your water in a pail it may be ice water if necessary and stir it with a wooden spoon. If you keep at it long enough it will certainly certain-ly boil. Five hours of rapid and constant con-stant stirring are sufficient to perform the feat successfully. The water will after a time warm, and then it will grow hot so hot, in fact, that you tan-not tan-not hold your hand in it, and finally it will boil. The point which the inventor in-ventor of this trick wishes to illustrate is what is known as the mechanical equivalent of heat. It requires so many foot pounds of work to develop a given quantity of heat. By turning the spoon in the water at a regular speed it is possible to find out just how much work is required to raise the temperature temper-ature of water to one degree. Heat is developed in almost any substance which is subjected to continuous or violent action. |