Convert kilocalorie (th) to Rydberg constant
Please provide values below to convert kilocalorie (th) [kcal (th)] to Rydberg constant [Ry], or Convert Rydberg constant to kilocalorie (th).
How to Convert Kilocalorie (Th) to Rydberg Constant
1 kcal (th) = 1.91937690346429e+21 Ry
Example: convert 15 kcal (th) to Ry:
15 kcal (th) = 15 × 1.91937690346429e+21 Ry = 2.87906535519643e+22 Ry
Kilocalorie (Th) to Rydberg Constant Conversion Table
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Kilocalorie (Th)
A kilocalorie (kcal) is a unit of energy equal to 1,000 calories, commonly used to measure the energy content of food and beverages.
History/Origin
The kilocalorie originated in the 19th century as a unit to quantify heat energy, especially in nutrition and thermodynamics. It was widely adopted in the early 20th century for dietary energy measurement.
Current Use
Today, the kilocalorie is primarily used in nutrition to express the energy content of food and drinks, although it is often simply called a 'calorie' in everyday language.
Rydberg Constant
The Rydberg constant (Ry) is a physical constant that represents the highest wavenumber (inverse wavelength) of any photon in the hydrogen atom's emission spectrum, used to calculate spectral lines.
History/Origin
Named after the Swedish physicist Johannes Rydberg, the Rydberg constant was introduced in the late 19th century as part of Rydberg's formula to describe the spectral lines of hydrogen, significantly advancing atomic physics.
Current Use
The Rydberg constant is used in quantum physics and spectroscopy to determine energy levels of hydrogen and other hydrogen-like atoms, and in calculations involving atomic spectra and quantum mechanics.