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Temperature scales In the USA, the Fahrenheit temperature scale is used. Most of the rest of the world uses Celsius, and in science it is often most convenient to use the Kelvin scale. The Celsius scale is based on the temperatures at which water freezes and boils. 0°C is the freezing point of water, and 100° C is the boiling point. Room temperature is about 20° C, a hot summer day might be 40° C, and a cold winter day would be around -20° C. To convert between Fahrenheit and Celsius, use these equations: The two scales agree when the temperature is -40°. A change by 1.0° C is a change by 1.8° F. The Kelvin scale has the same increments as the Celsius scale (100 degrees between the freezing and boiling points of water), but the zero is in a
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Unformatted text preview: different place. The two scales are simply offset by 273.15 degrees. The zero of the Kelvin scale is absolute zero, which is the lowest possible temperature that a substance can be cooled to. Several physics formulas involving temperature only make sense when an absolute temperature (a temperature measured in Kelvin) is used, so the fact that the Kelvin scale is an absolute scale makes it very convenient to apply to scientific work. two control rods are attached at A to lever AB. using trigonometry and knowing that the force in the left-hand rod is F= 30lb two forces P and Q are applied as shown at point A of a hook support. Knowing that P=45 lb...
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