Systems and Models of Environmental Systems and Societies

Topics: Measurement, Entropy, Thermodynamics Pages: 3 (831 words) Published: April 25, 2013
Representing Systems and Models: The Tea Lab
1) An open system exchanges matter and energy with its surroundings. A closed system exchanges energy but no matter with its environment. An isolated system exchanges neither matter nor energy with its environment. Isolated systems do not exist naturally though it is possible to think of the entire universe. The tea system is an open system because it exchanges energy (heat) with its air/surroundings. 2)

2) According to the first law of thermodynamics, the heat of the tea (could be the energy in this system) is converted to stored chemical energy. According to the second law of the thermodynamics, you lose energy at the moment that you bring the cup to your mouth, the moment that you just move a mm. etc. In general, all the time, because energy conversions are never 100% efficient, energy is ALWAYS waste, could be really a little bit, but it is.

Following a method: the Crepe Lab
Deals with description| Deals with numbers|
Data can be observed but not measured| Data can be measured| Colors, textures, smells, tastes, appearance, beauty, etc.| Length, height, area, volume, weight, speed, time, temperature, humidity, sound levels, cost, members, ages, etc.| ABOUT THE CREPES-The color that we get is milk-white and brown.- The texture is majority soft with possibly some crispy edges.- The smell is sweet, smells like eggs and sugar and also chocolate if we have put it at the end.- The taste is good, is sweet.- The appearance is good, it is not a perfect circle but is good anyways.- We can’t talk exactly about beauty because we’re analyzing a crepe, but as I’ve said before the appearance is good.| ABOUT THE CREPES * It doesn’t length or height a lot, because its area Is not bigger than 20 cm2. * The weight is about 50-100 gr. * The temperature (the final one) is about 30ºC....
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