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Thermometer pictures: What do we look at first?

Find more on weather instruments.

Some TV news programs show little thermometer pictures or temperature displays throughout the channel news weather and sports broadcast. Maybe something like this.

Why? Because that's what people in care most about regarding the weather. How warm it is or will become.

Television thermometer pictures usually display one value only, but many real indoor and outdoor thermometers have more...

Fahrenheit?

The third temperature

scale above where comfortable outdoor temperatures range from a cool 60 degrees (°F) to a warm 75 degrees or more. Below 50 is a fairly cold day; water freezes at 32.

Above 80 is usually considered hot weather while water boils at 212. To change to Celsius, add 40, divide by 9, multiply by 5, subtract 40. Easy

What is Celsius?

A capital C

marks the second temperature scale in the image. Comfortable outdoor temperatures are now expressed as from a cool 15 degrees (°C) to a warm 24. Below 10 is cold air and water freezes at zero.

Above 27 is often considered hot weather and 100 is the boiling temperature water has at sea level. Change from Celsius to Fahrenheit. Because of this freeze at zero, boil at a hundred attribute, the Celsius scale is also known as centigrade. centi means hundred

For a technical description, these two articles give you great detail on the history and development of the various temperature scales. Nearly a dozen of them.

1) Numerous scales

2) The invention of Fahrenheit and Celsius

Kelvin

The far left scale on the thermometer pictures above is simply the Celsius temperature plus 273. We call it the Kelvin scale, and is based on the fact that the so-called absolute zero, the coldest temperature possible, is roughly equal to –273.15 on the centigrade scale.

A technical definition meteorology people use for temperature:

The temperature of a body is one condition that determines its ability to transfer heat to other bodies or to receive heat from them, something thermoelectric heat sinks are designed for.

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How to get the best from your thermometer? The location of the thermometer is very important. Direct sunlight heats the thermometer and buildings can be a source of heat.

Both of these circumstances give false readings, with the sun temperatures being much higher.

At night the temperature at the ground can be several degrees colder than at eye level. To obtain official readings technicians install temperature recorders on the north side of a building, but not too close, or a tree, about six feet from the ground.

Better yet. They house the thing and other meteorological instruments in an enclosure called a Stephenson Screen.

Here's an interesting question? Why do charity campaigns and blood drives use large hand drawn pictures of thermometers to show progress? Like this one for instance...

Probably because our emotions have some connection with with this sight. It graphically demonstrates how much progress has been made and how much remains for their project.

Are you in the weather business? Get it on-line. This is how I did it.

Kinds of thermometers:

Advanced thermometer pictures and designs, such as infrared thermometers, make a weather satellite photo, and digital remote thermometers are used in special applications. For home decor, combinations such as thermometers with humidity displays or outdoor clock and thermometers are popular and useful.

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Most common thermometer pictures show one with a glass bulb full of liquid (such as mercury ether or alcohol), which expands and rises into a vertical tube marked with a scale showing the temperature in °F, °C or both.

You could even see a special apparatus this one in some thermometer pictures.

An electronic temperature sensor, a thermometer used in temperature-humidity data loggers is put into an electrical circuit as a resistor, the resistance of which changes as the temperature changes.

My wife got me a Galileo Thermometer one Christmas, like the one in this photo.

Cliking on this example of thermometer pictures will show you an article on how these things work.

A bi-metal strip thermometer is another clever one. Indoor thermometer pictures show this type used in the thermostat, a device that keeps temperature a steady inside your house. All metals expanded when heated, but at different rates.

With the device shown, manufacturers stick two strips of metal together and make a coil out of it. When the whole thing heats up, one of the metals expands faster than the other and the loop becomes tighter.

In other words it curls even more. Attach a needle to this apparatus and you can make it point to the correct temperature.

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Bet you didn't know we had so many choices in temperatures, did ya?

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