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This law was postulated in the 1930s, after the first and second laws of thermodynamics had been developed and named. It is called the zeroth law because it comes logically before the first and second laws (discussed in Thermodynamics ). An example of this law in action is seen in babies in incubators: babies in incubators normally have very few clothes on, so to an observer they look as if they may not be warm enough. However, the temperature of the air, the cot, and the baby is the same, because they are in thermal equilibrium, which is accomplished by maintaining air temperature to keep the baby comfortable.
Does the temperature of a body depend on its size?
No, the system can be divided into smaller parts each of which is at the same temperature. We say that the temperature is an intensive quantity. Intensive quantities are independent of size.
What does it mean to say that two systems are in thermal equilibrium?
Give an example of a physical property that varies with temperature and describe how it is used to measure temperature.
When a cold alcohol thermometer is placed in a hot liquid, the column of alcohol goes down slightly before going up. Explain why.
If you add boiling water to a cup at room temperature, what would you expect the final equilibrium temperature of the unit to be? You will need to include the surroundings as part of the system. Consider the zeroth law of thermodynamics.
What is the Fahrenheit temperature of a person with a fever?
Frost damage to most plants occurs at temperatures of or lower. What is this temperature on the Kelvin scale?
To conserve energy, room temperatures are kept at in the winter and in the summer. What are these temperatures on the Celsius scale?
and
A tungsten light bulb filament may operate at 2900 K. What is its Fahrenheit temperature? What is this on the Celsius scale?
The surface temperature of the Sun is about 5750 K. What is this temperature on the Fahrenheit scale?
One of the hottest temperatures ever recorded on the surface of Earth was in Death Valley, CA. What is this temperature in Celsius degrees? What is this temperature in Kelvin?
(a) Suppose a cold front blows into your locale and drops the temperature by 40.0 Fahrenheit degrees. How many degrees Celsius does the temperature decrease when there is a decrease in temperature? (b) Show that any change in temperature in Fahrenheit degrees is nine-fifths the change in Celsius degrees.
(a)
(b)
(a) At what temperature do the Fahrenheit and Celsius scales have the same numerical value? (b) At what temperature do the Fahrenheit and Kelvin scales have the same numerical value?
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