Scale termometriche
Le scale termometriche, dette anche scale di temperatura, sono scale graduate che si basano su diverse misure della temperatura. Esse vengono definite a partire da due valori di riferimento, detti punti fissi termometrici, a cui vengono assegnati valori arbitrari di temperatura.
Dopo aver spiegato che cos'è la temperatura passiamo a occuparci delle unità di misura che la caratterizzano. In questa lezione spiegheremo che cosa sono le scale termometriche e come vengono definite in generale, per poi soffermarci sulle tre scale di temperatura più diffuse e note a tutti: la scala celsius (o scala centigrada), la scala kelvin e la scala fahrenheit.
Poiché l'argomento è piuttosto vasto ed eterogeneo in questa lezione abbiamo convenuto di proporre una panoramica generale sulle scale termometriche. Per tutti gli approfondimenti del caso vi rimandiamo alle pagine che linkeremo nel corso della spiegazione, in cui ci soffermeremo sulle peculiarità di ciascuna scala termometrica (kelvin, celsius, fahrenheit) e sulle formule di conversione tra scale termometriche.
Definizione delle scale termometriche
Spesso accade in Fisica che esistano più unità di misura
Temperature scale - Celsius, Fahrenheit, Kelvin
Table of Contents:Kelvin scaleCelsius scaleFahrenheit scaleReaumur scaleHow and where different temperature scales are used
In everyday life and scientific work, people use several temperature scales, the most well-known of which are degrees Celsius, which is the international format in the International System of Units, and degrees Fahrenheit, which is used in everyday life by people living in the United States.
Kelvin scale
Thermodynamics uses the Kelvin scale, in which temperature is counted from absolute zero (the state corresponding to the minimum theoretically possible internal energy of a body), and one Kelvin equals 1/ the distance from absolute zero to the triple point of water (the state in which ice, water, and water vapor are in equilibrium). The Boltzmann constant is used to convert kelvins to energy units. Derived units are also used: kilokelvin, megakelvin, millikelvin, etc.
Celsius scale
The Celsius scale is part of the metric system and is used to measure temperature in most countries of the world in everyday life. The Celsius scale is referred to as °C (degrees Celsius). The Celsius scale was introduced in
Advanced Temperature Converter
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Temperature Converter
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Temperature Conversion Formulas
Understanding the mathematical relationships between different temperature scales.
From Celsius
From Fahrenheit
From Kelvin
Other Conversions
Converting from Celsius
Standard formulas to convert Celsius to other temperature scales:
Celsius to Fahrenheit: °F = (°C × 9/5) + 32
Celsius to Kelvin: K = °C +
Celsius to Rankine: °R = (°C + ) × 9/5
Celsius to Réaumur: °Ré = °C × 4/5
Celsius to Delisle: °De = ( - °C) × 3/2
Note: The Celsius scale was originally defined with 0°C as the freezing point of water and °C as the boiling point at standard atmospheric pressure.
Converting from Fahrenheit
Standard formulas to convert Fahrenheit to other temperature scales:
Fahrenheit to Celsius: °C = (°F - 32) × 5/9
Fahrenheit to Kelvin: K = (°F - 32) × 5/9 +
Fahrenheit to Rankine: °R = °F +
Fahrenheit to Réaumur: °Ré = (°F - 32) × 4/9
Fahrenheit to Delisle: °De = ( - °F) × 5/6
Note: The Fahrenhe
Réaumur scale
- This article is about the temperature scale. For other uses, see Réaumur (disambiguation).
The Réaumur scale (°Ré, °Re, °R) is a temperature scale named after René Antoine Ferchault de Réaumur, who first proposed it in The freezing point of water is 0 degrees Réaumur, the boiling point 80 degrees Réaumur. Hence, for converting a temperature expressed in degrees Réaumur to degrees Celsius one multiplies the temperature in degrees Réaumur by (In formula: °C = × °R). For calculating a temperature to Kelvin: K = × °R +
- To convert between Celsius and Reaumur use the following formula: (C×4)/5=Reaumur.
- To convert between Fahrenheit and Reaumur use the following formula: ((F)×4)/9=Reaumur
The Réaumur temperature scale is also known as the octogesimal division (division octogesimale in French).
Réaumur’s thermometer was constructed on the principle of taking the freezing point of water as 0°, and graduating the tube into degrees each of which was one-thousandth of the volume contained by the bulb and tube up to the zero mark. It was the dilatability of the particular quality of alcohol employed which made the boiling point of water 80°. Mercu
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