## Thursday, May 6, 2010

### One Hundred and Eighteen Posting ............... ( arhhhhhhhhhhh? )

Well guys, it a Tuesday morning, and do you know what that means? Thermofluid!! So, you might think, what the heck is thermofluid? Well, it is the study of thermodynamics and fluid mechanics, and this includes volatile liquids and air too.

Too bad during the holidays, I did not manage to study up to thermodynamics through my 'A Level Physics ... I think I stopped at Gravitation, and for 'A' Level Maths, haha, I cut half way to race for my Physics.. I think I stopped at around.... I forgotten.... sian.. Even the first few chapters I have already forgotten about. I understood about some certain graphs, but not all of it. Also, the translation and 'moving' of graphs, I also forgotten.... NEED TO RECAP!!

Any how, time for today's equation! Well, this is not considered as a equation, but it is a definition. New thing!

4 LAWS OF THERMODYNAMICS:
The Zeroth Law of Thermodynamics: If two different components (A and B ) are thermal equilibrium with another component ( C ), then, the first two components are also in thermal equilibrium. A poorly drawn picture is illustrated below. =P

The First Law of Thermodynamics: It states that the change in the internal energy, in a closed thermodynamic system, is equal to the Σ(heat) applied to the system, or the Σ(work done) on the system. Which means "Energy can neither be destroyed nor created, it can only transfer from one form to another."

The Second Law of Thermodynamics: The Σ(entropy) in a isolated system, gradually increases its temperature over time till it reaches thermal equilibrium with the surrounding. (Basically, this is talking about Entropy never decreases)

The Third Law of Thermodynamics: For this part, it is a little bit difficult to express in simple terms, so I got the information from Wikipedia. As a system asymptotically approaches absolute zero of temperature all processes virtually cease and the entropy of the system asymptotically approaches a minimum value; also stated as: "the entropy of all systems and of all states of a system is smallest at absolute zero" or equivalently "it is impossible to reach the absolute zero of temperature by any finite number of processes".

Absolute zero, at which all activity would stop if it were possible to happen, is −273.15 °C (degrees Celsius), or −459.67 °F (degrees Fahrenheit) or 0 K (kelvins, formerly sometimes degrees absolute).

And so, these 4 Laws are the basics fundamentals of thermodynamic and hopefully, you might have a clear idea of what the laws do. To round it all up, this post was actually for last Friday! HA HA! Did not have much time on that day to write finish the post... See you next time!