Fahrenheit

Examples of Fahrenheit in the following topics:

• Farenheit Scale

  • The Fahrenheit scale measures temperature.
  • It is based on a scale proposed in 1724 by physicist Daniel Gabriel Fahrenheit (1686-1736).
  • The unit of this scale is the degree Fahrenheit (°F).
  • The Fahrenheit system puts the boiling and freezing points of water exactly 180 degrees apart.
  • Explain how the Fahrenheit scale is defined and convert between it and Celsius

• Linear Transformations

  • A good example of this is the transformation between degrees Centigrade and degrees Fahrenheit.
  • For the conversion from Centigrade to Fahrenheit, the first constant is 1.8 and the second is 32.
  • Figure 1 shows a plot of degrees Centigrade as a function of degrees Fahrenheit.

• Effects of Linear Transformations

  • Recall that to transform the degrees Fahrenheit to degrees Centigrade, we use the formula
  • which means we multiply each temperature Fahrenheit by 0.556 and then subtract 17.7778.
  • As you might have expected, you multiply the mean temperature in Fahrenheit by 0.556 and then subtract 17.778 to get the mean in Centigrade.
  • The formula for the standard deviation is just as simple: the standard deviation in degrees Centigrade is equal to the standard deviation in degrees Fahrenheit times 0.556.
  • Since the variance is the standard deviation squared, the variance in degrees Centigrade is equal to 0.5562 times the variance in degrees Fahrenheit.

• Kelvin Scale

  • The Kelvin scale is named after Glasgow University engineer and physicist William Thomson, 1st Baron Kelvin (1824-1907), who wrote of the need for an "absolute thermometric scale. " Unlike the degree Fahrenheit and the degree Celsius, the kelvin is not referred to or typeset as a degree.
  • Relationships between the Fahrenheit, Celsius, and Kelvin temperature scales, rounded to the nearest degree.

• Converting Units

  • An example is the conversion between degrees Celsius and kelvins, or between Celsius and Fahrenheit.
  • In order to do this, you would need to know the conversion formula from Celsius to Fahrenheit.

• Temperature

  • The dawn of the 18th century saw great change in thermometers, thanks to the work of Isaac Newton, Anders Celsius, and Daniel Fahrenheit.
  • Fahrenheit was working with tubes filled with mercury, which has a very high coefficient of thermal expansion.
  • This, combined with the quality and accuracy of Fahrenheit's work, led to much greater sensitivity, and his thermometer was standardized against a brine solution and universally adopted, with the Fahrenheit scale being named in his honor.

• Levels of Measurement

  • As an example, consider the Fahrenheit scale of temperature.
  • The Fahrenheit scale illustrates the issue.
  • Zero degrees Fahrenheit does not represent the complete absence of temperature (the absence of any molecular kinetic energy).
  • After all, if the "zero" label were applied at the temperature that Fahrenheit happens to label as 10 degrees, the two ratios would instead be 30 to 10 and 90 to 40, no longer the same!
  • The Fahrenheit scale for temperature has an arbitrary zero point and is therefore not a ratio scale.

• Absolute Zero

  • By international agreement, absolute zero is defined as 0K on the Kelvin scale and as -273.15° on the Celsius scale (equivalent to -459.67° on the Fahrenheit scale).

• Absolute Temperature

  • Note that this equation would not look this elegant if the Fahrenheit scale were used instead.

• Scrotum

  • For human beings, the temperature should be one or two degrees Celsius below body temperature (around 35 degrees Celsius or 95 degrees Fahrenheit); higher temperatures may be damaging to sperm count.