It is the temperature scale value "-40" degrees.
The scale point of -40 is equal for degrees Celsius and degrees Fahrenheit.
oF = 32 + 1.8*oC = 273.15 + oC = Kelvin results in oC = 301.44 so 574.59 = F = K
negative 40 degrees is the same temperature on both scales
[K] = ([°F] + 459.67) × 5⁄9
[°F] = [K] × 9⁄5 − 459.67
-45 degrees
This point is call the "triple point" and this is where all three lines meet together on the phase diagram.
low melting point and high conductivity
low melting point and high conductivity
The triple point of a phase diagram is the location where the solid, liquid, and gas phases meet; it is the temperature and pressure at which a given substance can assume any of the 3 usual phases of matter.
There is a difference between where the two lines meet and where the greatest tempurature change is... think about it... the two lines do not meet where the greatest tempurature change is, the two lines meet where the greatest amount of heat is given off...
The scales of temperature cannot all meet, as the Kelvin and Celsius scales have the same size degrees but different zero points. Absolute Zero is 0° Kelvin, and equal to -273.15 °C or -459.67 °F. Because the Celsius and Fahrenheit scales are offset by 32° at their starting points (freezing point of water), the two scales do have a common numerical point at -40° (minus 40 degrees). (see related question)
-40 F = -40 C. -40 is the point where the two scales "meet".
It is a pure coincidence. Nothing special.
The point at which the Celsius and Fahrenheit scales meet is -40 degrees. -40 degrees Celsius is equal to -40 x 9 = -360 / 5 = -72 + 32 = -40 degrees Fahrenheit.
The scales of degrees Celsius and Fahrenheit are equivalent at -40 degrees.
The Kelvin scale begins at absolute zero (-459.67 °F), but because the Kelvin/Celsius degree intervals are larger, eventually the two scales will intersect. This occurs at 574.5875 K or 574.5875 °F, a temperature equal to 301.4375 °C . Calculation The formula T(K) = T(F) as expressed in C(Celsius). C + 273.15 = (9/5 C) +32 4/5 C = 241.15 C = 301.4375° (574.5875 K and 574.5875 °F )
-40 C is -40 F: it is the point where the scales meet.
-40 A lot of people like to use this as a trick question. -40 is where the two scales meet.
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Was that on purpose? Because it just so happens that -40 is where the two meet! -40 degrees Celsius = -40 degrees Fahrenheit. Was that on purpose? Because it just so happens that -40 is where the two meet! -40 degrees Celsius = -40 degrees Fahrenheit.
The temperature that has the same numerical value in Kelvin and Celsius is -273.15 degrees. At this temperature, known as absolute zero, there is no molecular movement, and it is the lowest possible temperature.
Because the relation is 9/5 C + 32 = F; if you let F = C you find the point they are the same: -40F = -40C