A love thermometer refers to a toy known as a hand boiler, which uses a combination of temperature and pressure in an enclosed glass tube to appear as if the liquid boils just by placing hands on one of the ends of the d... More »

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A liquid thermometer works by using the thermal expansion of a liquid within a capillary tube to measure temperature. The precision of this method varies by the liquid used, but all use the fact that when most liquids ar... More »

Digital thermometers work on the principle that changes in temperature cause the resistance of a sensor to change allowing a computer to convert the difference to a digital read-out. The sensor is a thermoresistor, commo... More »

To make a BB gun with a pen, remove the ink tube and the ends from a ballpoint pen. Remove the lead from a mechanical pencil, and put the hollow tube inside the pen. Cut a notch in the eraser, and wrap the pen with rubbe... More »

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A liquid thermometer works by using the thermal expansion of a liquid within a capillary tube to measure temperature. The precision of this method varies by the liquid used, but all use the fact that when most liquids ar... More »

A pneumatic thermostat is a specially designed device that controls the heating or air conditioning system of a house through a control tube filled with air that can send signals, and it works by using a metallic strip t... More »

The operating instructions for a Rubik's Cube consist of placing the hands on either side of the device and twisting one or two segments to rotate the colors to a new position. Each segment is capable of moving in two di... More »