Saturday, 26 July 2014

Think 1


Concept:   Thermal energy travels from hotter region to colder region. 
My Answer: 
On a hot day, our body(colder region) gain thermal energy from the hot surroundings(hotter region)
Our body has more thermal energy than the air-conditioned surroundings. Therefore when we enter the air-con room,  thermal energy travels from our body to the colder surroundings. When our body lost thermal energy, we would feel cold.

Further Thinking:
Why does our body gain heat from the hot surroundings?

Human body maintains at a internal temperature of 37°C. Variations, usually of less than 1°C, occur with the time of the day, level of physical activity and emotional state. A change of body temperature occurs only during illness or when environmental conditions are more than the body's ability to cope with extreme heat.
As the environment temperature increases, the body temperature increases. The body's internal "thermostat" maintains a constant inner body temperature by pumping more blood to the skin and by increasing sweat production. In this way, the body increases the rate of heat loss to balance with the heat gain. In a very hot environment, the rate of "heat gain" is more than the rate of "heat loss" causing body temperature to rise. A rise in the body temperature results in heat illnesses.

3Main Ideas need to be included:
-Why you feel cold?
You lose thermal energy

Why your body lose thermal energy?
-(Concept) Thermal energy travels from a hotter region to a colder region.
Hotter Region--Body
Colder Region--AirCon Room

- "Hot Day"must show relevance to answer
On a hot day, our bodies gain thermal energy from the hot surroundings

Notes from Class Discussion:
-Don't use atoms/particles in physics. Correct term is molecules when you are talking about something at the micro level.
-It is your choice to decide on macro/micro
-Use the term "Thermal Energy" not heat

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