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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:
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).
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.
Kelvin and his brother James Thomson confirmed the relation experimentally in 1849–50, and it was historically important as a very early successful application of theoretical thermodynamics. [5] Its relevance to meteorology and climatology is the increase of the water-holding capacity of the atmosphere by about 7% for every 1 °C (1.8 °F ...
The kelvin is one of the seven base units in the International System of Units (SI). Absolute zero, i.e., zero kelvin or −273.15 °C, is the lowest point in the thermodynamic temperature scale. Experimentally, it can be approached very closely but not actually reached, as recognized in the third law of thermodynamics. It would be impossible ...
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 ...
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