Types of Thermodynamic Systems

There are three mains types of system: open system, closed system and isolated system. All these have been described below:

1) Open system: The system in which the transfer of mass as well as energy can take place across its boundary is called as an open system. Our previous example of engine is an open system. In this case we provide fuel to engine and it produces power which is given out, thus there is exchange of mass as well as energy. The engine also emits heat which is exchanged with the surroundings. The other example of open system is boiling water in an open vessel, where transfer of heat as well as mass in the form of steam takes place between the vessel and surrounding.

2) Closed system: The system in which the transfer of energy takes place across its boundary with the surrounding, but no transfer of mass takes place is called as closed system. The closed system is fixed mass system. The fluid like air or gas being compressed in the piston and cylinder arrangement is an example of the closed system. In this case the mass of the gas remains constant but it can get heated or cooled. Another example is the water being heated in the closed vessel, where water will get heated but its mass will remain same.

3) Isolated system: The system in which neither the transfer of mass nor that of energy takes place across its boundary with the surroundings is called as isolated system. For example if the piston and cylinder arrangement in which the fluid like air or gas is being compressed or expanded is insulated it becomes isolated system. Here there will neither transfer of mass nor that of energy. Similarly hot water, coffee or tea kept in the thermos flask is closed system. However, if we pour this fluid in a cup, it becomes an open system.

Source: http://hockeyschtick.blogspot.com/2015/01/why-earth-is-closed-thermodynamic.html

CHARLIE MUNGER ON THE PSYCHOLOGY OF HUMAN MISJUDGMENT

Sources:

http://www.rbcpa.com/mungerspeech_june_95.pdf
https://www.youtube.com/watch?v=pqzcCfUglws

Second Law of Thermodynamics and Economics

How efficient is the US economy in converting materials and energy to productive work?

Ans: ~2 %


Source:

https://www.youtube.com/watch?v=coTeKpIcBbs

Rising Un-employment and mortality rate

"Economic growth is the single most important factor relating to length of life," said principal investigator M. Harvey Brenner, visiting professor in the Global Health Division of the Department of Epidemiology and Public Health at Yale School of Medicine. Brenner is also professor of health policy and management at Johns Hopkins University and senior professor of epidemiology at Berlin University of Technology.

"Employment is the essential element of social status and it establishes a person as a contributing member of society and also has very important implications for self-esteem," said Brenner. "When that is taken away, people become susceptible to depression, cardiovascular disease, AIDS and many other illnesses that increase mortality."

....

Brenner said the best way to address the issue of unemployment and mortality is to have a society that invests in educating people in the kinds of jobs that will drive the 21st century, such as science and technology fields.

"We have evolved into a more thought-based workforce, so it is imperative that society maintain a highly-educated population," said Brenner. "This is the central fact of well-being and life expectancy."

Source:

http://news.yale.edu/2002/05/23/rising-unemployment-causes-higher-death-rates-new-study-yale-researcher-shows

On Earnst Mayr

There are so many great scientists that we do not know...

Earsnt Mayr is surely is one of the best.


https://www.youtube.com/watch?v=In-FR-euCL8

We Live in Public

Freedom is not free

See:https://www.youtube.com/watch?v=GTMOQaK_xt4

Fasting and its benefits

Fasting is healthy...

It challenges the mind to be healthy...



See: https://www.youtube.com/watch?v=4UkZAwKoCP8