This problem will help you understand why the wind blowing makes you feel colder, especially in the winter. You are outside on a cold day. The air temperature overall is around 5° C; assume your skin temperature is 16° C a) If you stay outside for a while and there is no wind, the air around you will eventually increase in temperature past 5° C. Explain why the air heats up, using the idea of conduction. b) What is the highest temperature the air around you can reach? Explain. c) As the air around you warms up, explain why you start cooling down more slowly.
Energy transfer
The flow of energy from one region to another region is referred to as energy transfer. Since energy is quantitative; it must be transferred to a body or a material to work or to heat the system.
Molar Specific Heat
Heat capacity is the amount of heat energy absorbed or released by a chemical substance per the change in temperature of that substance. The change in heat is also called enthalpy. The SI unit of heat capacity is Joules per Kelvin, which is (J K-1)
Thermal Properties of Matter
Thermal energy is described as one of the form of heat energy which flows from one body of higher temperature to the other with the lower temperature when these two bodies are placed in contact to each other. Heat is described as the form of energy which is transferred between the two systems or in between the systems and their surrounding by the virtue of difference in temperature. Calorimetry is that branch of science which helps in measuring the changes which are taking place in the heat energy of a given body.
3. This problem will help you understand why the wind blowing makes you feel colder, especially in the
winter.
You are outside on a cold day. The air temperature overall is around 5° C; assume your skin temperature
is 16° C
a) If you stay outside for a while and there is no wind, the air around you will eventually increase in
temperature past 5° C. Explain why the air heats up, using the idea of conduction.
b) What is the highest temperature the air around you can reach? Explain.
c) As the air around you warms up, explain why you start cooling down more slowly.
d) If the wind blows,
more 5° C cold air. In this case, will you cool down more quickly or more slowly? Explain.
e) Explain why the “wind chill” temperature (ie, the temperature it feels like when the wind is blowing)
is colder than the actual temperature of the air.
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