# Sacsacas

Topics: Temperature, Thermodynamics, Absolute zero Pages: 15 (3614 words) Published: October 27, 2012
Interconversion of Temperature Scales
Celsius
The world's most common temperature scale is Celsius. Abbreviated C, it is virtually the same as the old centigrade scale and therefore has 100 degrees between the melting point and boiling point of water, taken to occur at 0 and 100 degrees, respectively. Kelvin

Temperature is a measure of the thermal energy of a system. Thus cooling can proceed only to the point at which all of the thermal energy is removed from the system, and this process defines the temperature of absolute zero. The Kelvin scale, also called the absolute temerature scale, takes its zero to be absolute zero. It uses units of kelvins (abbreviated K), which are the same size as the degrees on the Celsius scale. Fahrenheit

This anachronistic temperature scale, used primarily in the United States, has zero defined as the lowest temperature that can be reached with ice and salt, and 100 degrees as the hottest daytime temperature observed in Italy by Torricelli. A. In the equation of state for the perfect gas, [pic], which of the following three temperature scales must be used? |[pic]Celsius | | |

|[pic]Kelvin | | |
|[pic]Fahrenheit | | |

B. What is the formula used to convert a temperature in degrees Celsius ([pic]) to the same temperature in kelvins ([pic])?

Express [pic]in terms of [pic].
|[pic]=|T_C + 273 | | |
| |or | | |
| |T_C + 273.15 | | |
| | | | |

C. What is the formula used to convert a temperature in degrees Fahrenheit ([pic]) to the same temperature in degrees Celsius ([pic])?

Express [pic]in terms of [pic].
|[pic]=|Answer not displayed | | |

D. It is possible to get a good "feel" for the Celsius scale because multiples of 10 have special significance: o [pic]: very cold weather;
o [pic]: water freezes;
o [pic]: a cool day, so wear a jacket outside;
o [pic]: room temperature;
o [pic]: a hot day, so drink extra water;
o [pic]: a high fever.
Convert these six temperatures into Fahrenheit.

Enter the temperatures to the nearest Fahrenheit degree, ordering them from smallest to largest, separated with commas. |Temperatures = |14 |degrees Fahrenheit | | | |, | | | | |32 | | | | |, | | | | |50 | | | | |, | | | | |68 | | | | |, | | | | |86 | | | | |, | | | | |104 | | | | | | | |

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Steam vs. Hot-Water Burns
Just about everyone at one time or another has been burned by hot water or steam. This problem compares the heat input to your skin from steam as opposed to hot water at the same temperature. Assume that water and steam, initially at 100[pic]C, are cooled down to skin temperature, 34[pic]C, when they come in contact with your skin. We will simply ask how much heat is transferred to the skin from equal amounts (by weight) of steam and...