This entry is about old time mercury or liquid style thermometers. Not the digital ones. A thermometer that looks like the one above.
A thermometer, just like all other inventions, is based on the human body.
A thermometer works by the level of liquid inside of the thermometer rising to the required marking on the outside of the thermometer. A thermometer is usually depicted with a low temperature rising up to a higher temperature.
The most obvious inspiration from the human body is of course the male sex organ. A thermometer looks like a male sex organ. The mercury reservoir bulb at the bottom of the thermometer looks like the scrotum. The glass column itself is the penis. The fluid that rises inside of the thermometer is equivalent to the penis itself rising when it is “hot”, and lowering when it is “cold”.
The second inspiration from the human body is less obvious but also involves the sex organs. When the human body is stimulated sexually, and also in other ways, there are areas of the back that can “rise up” in the same way that the penis rises up when it is stimulated. When these areas are not stimulated, they shrink or lower the same way a penis shrinks or lowers.
The scrotum again plays the part of the mercury bulb in this example with the back playing the part of the straight section of a thermometer.