A clinical mercury thermometerGalileo thermometerMercury-in-glass thermometer
Discover great deals on the many hard to find and one of a kind items available only on eBay!

Thermometers

A thermometer is a device that measures temperature or temperature gradient, using a variety of different principles. The word thermometer is derived from two smaller word fragments: thermo from the Greek for heat and meter also from Greek, meaning to measure. more...

HomeHome
Bird & Wildlife AccessoriesBird & Wildlife Accessories
Garden DécorGarden Décor
Flags & FlagpolesFlags & Flagpoles
Garden StakesGarden Stakes
Gazing BallsGazing Balls
OtherOther
Plaques & SignsPlaques & Signs
Rain GaugesRain Gauges
Statues & Yard ArtStatues & Yard Art
Stepping Stones & RocksStepping Stones & Rocks
SundialsSundials
ThermometersThermometers
Water FeaturesWater Features
WeathervanesWeathervanes
Wind ChimesWind Chimes
WindmillsWindmills
Windsocks & DevasWindsocks & Devas
Garden Structures & FencingGarden Structures & Fencing
Gardening & PlantsGardening & Plants

A thermometer has two important elements, the temperature sensor (e.g. the bulb on a mercury thermometer) in which some physical change occurs with temperature, plus some means of converting this physical change into a value (e.g. the scale on a mercury thermometer). Industrial thermometers commonly use electronic means to provide a digital display or input to a computer.

Thermometers can be divided into two groups according to the level of knowledge about the physical basis of the underlying thermodynamic laws and quantities. For primary thermometers the measured property of matter is known so well that temperature can be calculated without any unknown quantities. Examples of these are thermometers based on the equation of state of a gas, on the velocity of sound in a gas, on the thermal noise (see Johnson–Nyquist noise) voltage or current of an electrical resistor, and on the angular anisotropy of gamma ray emission of certain radioactive nuclei in a magnetic field.

Secondary thermometers are most widely used because of their convenience. Also, they are often much more sensitive than primary ones. For secondary thermometers knowledge of the measured property is not sufficient to allow direct calculation of temperature. They have to be calibrated against a primary thermometer at least at one temperature or at a number of fixed temperatures. Such fixed points, for example, triple points and superconducting transitions, occur reproducibly at the same temperature.

Internationally agreed temperature scales are based on fixed points and interpolating thermometers. The most recent official temperature scale is the International Temperature Scale of 1990. It extends from 0.65 K to approximately 1358 K (−272.5 °C to 1085 °C).

Early history

Various authors have credited the invention of the thermometer to Abū Alī ibn Sīnā (usually known as Avicenna), Cornelius Drebbel, Robert Fludd, Galileo Galilei or Santorio Santorio. But the thermometer was not a single invention, it was a development.

Philo and Hero of Alexandria knew of the principle that certain substances, notably air, expand and contract and described a demonstration, in which a closed tube partially filled with air had its end in a container of water. The expansion and contraction of the air caused the position of the water/air interface to move along the tube.

Similar devices used to show the hotness and coldness of the air with a tube in which the water level is controlled by the expansion and contraction of the air, were developed by Avicenna in the early 11th century, and by several European scientists in the 16th and 17th centuries, notably Galileo Galilei. As a result, devices were shown to produce this effect reliably, and the term thermoscope was adopted because it reflected the changes in sensible heat (the concept of temperature was yet to arise). The difference between a thermoscope and a thermometer is that the latter has a scale. Though Galileo is often said to be the inventor of the thermometer, what he produced was a thermoscope.

Read more at Wikipedia.org


[List your site here Free!]

Glitzhome 48' Glossy Metal Sunflower Thermometer Yardstake Outdoor Garden DecorGlitzhome 48' Glossy Metal Sunflower Thermometer Yardstake Outdoor Garden Decor $29.99 Lot Of 2 Large Jumbo Thermometers Outdoor Indoor - 2 1/2' X 16" Easy Read GardenLot Of 2 Large Jumbo Thermometers Outdoor Indoor - 2 1/2' X 16" Easy Read Garden $11.95
$60.52 Outdoor Thermometer Garden Patio Outside Copper Tone Metal Sun Moon Accents NewOutdoor Thermometer Garden Patio Outside Copper Tone Metal Sun Moon Accents New $19.99
Wall Thermometer Indoor Outdoor Mount Garden Greenhouse Home Humidity MeterWall Thermometer Indoor Outdoor Mount Garden Greenhouse Home Humidity Meter $6.46 Alpine 42 In. H. Metallic Flower Thermometer Stake Ljj1180 Pack of 12 AlpineAlpine 42 In. H. Metallic Flower Thermometer Stake Ljj1180 Pack of 12 Alpine $382.19
Window Thermoneter W/ 2 Suction Cups Green Frog 7.87" X 3.54" PlasticWindow Thermoneter W/ 2 Suction Cups Green Frog 7.87" X 3.54" Plastic $7.19 2 Pack Wooden Gaeden Depot Jumbo Thermometer Patio, Garden, Outside Accessories2 Pack Wooden Gaeden Depot Jumbo Thermometer Patio, Garden, Outside Accessories $14.95
Metal Thermometer Stake Weather Resistant Decoration Homes Yards Gardens OutdoorMetal Thermometer Stake Weather Resistant Decoration Homes Yards Gardens Outdoor $28.99 Thermometer Temperature Tool Accessory Garden Greenhouse Indoor/Outdoor OutsideThermometer Temperature Tool Accessory Garden Greenhouse Indoor/Outdoor Outside $9.14
Wooden Gaeden Depot Jumbo Thermometer Patio, Garden, Outside AccessoriesWooden Gaeden Depot Jumbo Thermometer Patio, Garden, Outside Accessories $8.95 54583 Outdoor Thermometer Garden Stake, Dragonfly, Multi54583 Outdoor Thermometer Garden Stake, Dragonfly, Multi $46.53
Metal Solar Peacock Thermometer Garden StakeMetal Solar Peacock Thermometer Garden Stake $32.00 Decorative Wall Large Indoor Outdoor Round Garden Patio Thermometer HygrometerDecorative Wall Large Indoor Outdoor Round Garden Patio Thermometer Hygrometer $27.32
Outdoor Thermometers Patio Sunflower Metal Stake Garden Decors Yard DecorationsOutdoor Thermometers Patio Sunflower Metal Stake Garden Decors Yard Decorations $48.39 Garden gnome with thermometerGarden gnome with thermometer $19.99
Thermometer Stake Flower Petals Outdoor Garden Yard Lawn Decor Patio Pathway ArtThermometer Stake Flower Petals Outdoor Garden Yard Lawn Decor Patio Pathway Art $89.99 Pure Garden Wall Thermometer-Decorative Indoor Outdoor Temperature and HygrometePure Garden Wall Thermometer-Decorative Indoor Outdoor Temperature and Hygromete $33.99
White Shabby Cast Iron Thermometer Bird Cage Wall Indoor Outdoor Garden DecorWhite Shabby Cast Iron Thermometer Bird Cage Wall Indoor Outdoor Garden Decor $26.80 Rain Gauge Thermometer Butterfly Owl Garden Decor Sculptur Yard Lawn Patio StakeRain Gauge Thermometer Butterfly Owl Garden Decor Sculptur Yard Lawn Patio Stake $65.99
Solar Peacock Pathway Stake Thermometer Lights Garden Yard Lawn Decor Patio ArtSolar Peacock Pathway Stake Thermometer Lights Garden Yard Lawn Decor Patio Art $63.99 Solar Owl Thermometer Garden Stake Weather Decor Lawn Garden Patio Porch YardSolar Owl Thermometer Garden Stake Weather Decor Lawn Garden Patio Porch Yard $66.99
Vertical Jumbo Thermometer 15.75 Inch Extra-Large Numbers Indoor/Outdoor PatioVertical Jumbo Thermometer 15.75 Inch Extra-Large Numbers Indoor/Outdoor Patio $9.99 Pottery garden hanging thermometerPottery garden hanging thermometer $6.29
Garden critters thermometerGarden critters thermometer $12.95 Patio Thermometer Low Profile Round Star Garden Weather Resistant Home Classic FPatio Thermometer Low Profile Round Star Garden Weather Resistant Home Classic F $28.57
Sun flower Outdoor Thermometer with Metal Stake outside Decorative ThermometerSun flower Outdoor Thermometer with Metal Stake outside Decorative Thermometer $47.02 31.5 Inch Rain Gauge with Thermometer, Butterfly & Owl Garden Stakes Decor31.5 Inch Rain Gauge with Thermometer, Butterfly & Owl Garden Stakes Decor $31.52
Pro Garden 11 inch Long Outside Metal Thermometer, Choice of ColorPro Garden 11 inch Long Outside Metal Thermometer, Choice of Color $12.95 Nostalgic-Art - Metal Garden Outdoor Indoor Thermometer Analog - Coca-Cola #2Nostalgic-Art - Metal Garden Outdoor Indoor Thermometer Analog - Coca-Cola #2 $16.95
1/2Pcs Wall Thermometer Indoor Outdoor Mount Garden Greenhouse Home Humidity Met1/2Pcs Wall Thermometer Indoor Outdoor Mount Garden Greenhouse Home Humidity Met $4.08 to Outdoor Metal Thermometer Stake Weather Resistant Decoration Homes Yards GardensOutdoor Metal Thermometer Stake Weather Resistant Decoration Homes Yards Gardens $19.42
Outdoor Thermometer Large Dial Weather Temperature Patio Wall Garden Decor 13.25Outdoor Thermometer Large Dial Weather Temperature Patio Wall Garden Decor 13.25 $40.99 Fairy Blossoms Thermometer, Bright Yellow Garden Decor, Nip -Price Reduced!Fairy Blossoms Thermometer, Bright Yellow Garden Decor, Nip -Price Reduced! $3.00
Serenity Garden Indoor Outdoor Flower Design Wall Thermometer Resin w/Box O3Serenity Garden Indoor Outdoor Flower Design Wall Thermometer Resin w/Box O3 $15.96 Sun 🌞Garden Thermometer-Outdoor Indoor-Resin-9”x5”-Pa tio-Porch-New In BoxSun 🌞Garden Thermometer-Outdoor Indoor-Resin-9”x5”-Pa tio-Porch-New In Box $9.99
2pc Wall Thermometer Indoor Outdoor Hanging Garden Greenhouse House Office Room2pc Wall Thermometer Indoor Outdoor Hanging Garden Greenhouse House Office Room $4.58 Metal Peacock Outdoor Decoration Garden Statue Sculpture Solar with ThermometerMetal Peacock Outdoor Decoration Garden Statue Sculpture Solar with Thermometer $48.99
Nostalgic-Art - Metal Garden Outdoor Indoor Thermometer Analog - Weather CatNostalgic-Art - Metal Garden Outdoor Indoor Thermometer Analog - Weather Cat $16.95 Garden Thermometers Classic Red Alcohol Select: 8-Inch or 15.75-Inch ThermometerGarden Thermometers Classic Red Alcohol Select: 8-Inch or 15.75-Inch Thermometer $2.99 to
Resistant Outdoor Metal Thermometer Stake Weather Decoration Homes Yards GardensResistant Outdoor Metal Thermometer Stake Weather Decoration Homes Yards Gardens $31.66 Metal Peacock Decor Garden Solar Light Outdoor Thermometer Decorative Stake LawnMetal Peacock Decor Garden Solar Light Outdoor Thermometer Decorative Stake Lawn $78.16
Garden Fishing Lunkers Tin Thermometer Cabin Lodge Home Wall DecorGarden Fishing Lunkers Tin Thermometer Cabin Lodge Home Wall Decor $24.95 Outdoor Metal Thermometer Garden Stake Weather Decor Lawn Garden Patio Porch ArtOutdoor Metal Thermometer Garden Stake Weather Decor Lawn Garden Patio Porch Art $69.99
Vtg French Enameled indoor/outdoor patio wall thermometer Metal Made In FranceVtg French Enameled indoor/outdoor patio wall thermometer Metal Made In France $24.99 Indoor Outdoor Thermometer Wireless - Garden Wall Thermometer Hygrometer for PatIndoor Outdoor Thermometer Wireless - Garden Wall Thermometer Hygrometer for Pat $22.87
Cabin Lodge Fish Garden Wall Tin Thermometer Cabin Lodge Home Wall DecorCabin Lodge Fish Garden Wall Tin Thermometer Cabin Lodge Home Wall Decor $24.95 1&2Pcs Indoor Wall Thermometer Outdoor Mount Garden Greenhouse Home Humidity Met1&2Pcs Indoor Wall Thermometer Outdoor Mount Garden Greenhouse Home Humidity Met $3.74 to
Outdoor Thermometer Jumbo 16" Analog Garden Patio Porch Yard Free ShippingOutdoor Thermometer Jumbo 16" Analog Garden Patio Porch Yard Free Shipping $10.89 Large Outdoor Wall Analog Patio Thermometer for Temp Read with Mounting BracketLarge Outdoor Wall Analog Patio Thermometer for Temp Read with Mounting Bracket $17.28
Best Bait Fishing Lures Garden Tin Thermometer Cabin Lodge Home Wall DecorBest Bait Fishing Lures Garden Tin Thermometer Cabin Lodge Home Wall Decor $24.95
Click to see more Thermometers items at www.ebay.com
Prices current as of last update, 06/19/22 6:14am.

Home Contact Resources Exchange Links eBay