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In fluid mechanics, Kelvin's circulation theorem (named after William Thomson, 1st Baron Kelvin who published it in 1869) states: [1][2] In a barotropic, ideal fluid with conservative body forces, the circulation around a closed curve (which encloses the same fluid elements) moving with the fluid remains constant with time. Stated mathematically:
Comparison of temperature scales. * Normal human body temperature is 36.8 °C ±0.7 °C, or 98.2 °F ±1.3 °F. The commonly given value 98.6 °F is simply the exact conversion of the nineteenth-century German standard of 37 °C. Since it does not list an acceptable range, it could therefore be said to have excess (invalid) precision.
The ideal correlated colour temperature of a light source is the absolute temperature at which the Planckian radiator emits radiant energy component to evoke a colour which, of all Planckian colours, most closely approximates the colour evoked by the source in question. from Research Paper 365. ^ abJudd, Deane B. (1931).
File:Kelvin Temperature Chart.svg. Size of this PNG preview of this SVG file: 800 × 354 pixels. Other resolutions: 320 × 142 pixels | 640 × 283 pixels | 1,024 × 453 pixels | 1,280 × 567 pixels | 2,560 × 1,133 pixels | 1,324 × 586 pixels. This is a file from the Wikimedia Commons. Information from its description page there is shown below.
The 19th century British scientist Lord Kelvin first developed and proposed the scale. [5] It was often called the "absolute Celsius" scale in the early 20th century. [6] The kelvin was formally added to the International System of Units in 1954, defining 273.16 K to be the triple point of water.
The original form of the Kelvin equation, published in 1871, is: [1] where: = vapor pressure at a curved interface of radius. = vapor pressure at flat interface ( ) =. = surface tension. = density of vapor. = density of liquid. , = radii of curvature along the principal sections of the curved interface. This may be written in the following form ...
Contracted from the term micro reciprocal degree, the mired (/ ˈmaɪrɛd / [1]) is a unit of measurement used to express color temperature. Values in mireds are calculated by the formula: where T is the colour temperature in units of kelvins and M denotes the resulting mired dimensionless number. The constant 1 000 000 K is one million kelvins.
Thermodynamic temperature is a quantity defined in thermodynamics as distinct from kinetic theory or statistical mechanics.. Historically, thermodynamic temperature was defined by Lord Kelvin in terms of a macroscopic relation between thermodynamic work and heat transfer as defined in thermodynamics, but the kelvin was redefined by international agreement in 2019 in terms of phenomena that are ...
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