What is Refrigerator

Prior to the invention of refrigerators, food preservation imposed serious constraints. The best options were to suspend food in rivers, wells, or at the bottom of lakes, and absent these tactics, stable foods were heavily salted, spiced, pickled, or dried to prevent bacterial growth. With the industrial age, we began to understand thermodynamic cycles and—through an interplay of pumps, valves, and heat exchange—learned to cool food to arbitrary temperatures with the refrigerator cycle. We just saw that the refrigerator carries out a cycle to move heat out from the food compartment and into the room. This occurs via three main components: A pump that compresses gas. A valve that expands gas. Radiators that allow gas to exchange heat with the …

Knowledge, Experience, Creativity

Someday your teacher said, F = m.a where a is vector of acceleration and m is a mass. Or it must be P = ρgh, p = m.v, W = ΔE blah blah blah. They are called knowledge and since we know it, we should able to create something. For example, from the second Newton equation, we can know many things like, thing must accelerate at the same direction as total force works into it and the heavier its mass, the more Force needed to make it accelerated more. But, how to apply that equation in our life? Have you ever wonder why our car need an adjustable brake and accelerator pedal? why don’t they make it single value? And why bigger airplane need bigger wings to …

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