How do outdoor thermometers work?

Answer 1

The bulb thermometer--the common glass type--is filled with a fluid such as Mercury. The liquid changes its volume relative to its temperature, moving up and down the tube as it heats up or cools down. The mercury takes up less space when it is cold and more when it is hot.

An outdoor thermometer measures the temperatures of the surrounding air and is usually affixed to the sides of houses or decks to give an exact reading of the temperature in the immediate area. The bulb of the thermometer--the common glass type--is filled with a fluid such as mercury. The liquid changes its volume relative to its temperature, moving up and down the tube as it heats up or cools down. The mercury takes up less space when it is cold and more when it is hot.

Answer 2

The Galileo thermometer consists of a sealed glass tube that is filled with water and several floating bubbles. The bubbles are glass spheres filled with a colored liquid mixture. This liquid mixture may contain alcohol, or it might simply be water with food coloring.

Attached to each bubble is a little metal tag that indicates a temperature. A number and degree symbol are engraved in the tag. These metal tags are actually calibrated counterweights. The weight of each tag is slightly different from the others. Since the bubbles are all hand-blown glass, they aren't exactly the same size and shape. The bubbles are calibrated by adding a certain amount of fluid to them so that they have the exact same density. So, after the weighted tags are attached to the bubbles, each differs very slightly in density (the ratio of mass to volume) from the other bubbles, and the density of all of them is very close to the density of the surrounding water.

If you have read this question, then you know that an object immersed in a fluid experiences two major forces: the downward pull of gravity and the upward push of buoyancy. It is the downward force of gravity that makes this thermometer work.

The basic idea is that as the temperature of the air outside the thermometer changes, so does the temperature of the water surrounding the bubbles. As the temperature of the water changes, it either expands or contracts, thereby changing its density. So, at any given density, some of the bubbles will float and others will sink. The bubble that sinks the most

Read more: How_does_a_galileo_thermometer_work

Answer 3

I'm not sure that I understand the question, but I know of thermometers that have a wireless connection so you can check the temperature from a distance. It works like a cordless phone - it has a wireless connection. Liquids and other materials expand in proportion to the amount of heat they contain.

Answer 4

Outdoor thermometers are filled with mercury that changes its volume relative to the temperature. The mercury will move up and down as the temperature changes.