Chemical Engineering Basics
Air refrigeration cycle is used in the air crafts, because of

Low temperature encountered at high altitude
Its low unit weight per ton of refrigeration
Its high heat transfer rate
Its higher co-efficient of performance (COP)

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Chemical Engineering Basics
Maraging steels derive their strength from the following mechanism:

Fine dispersions of alloy carbides in a ferrite matrix
Fine dispersions of Fe₃ C nucleated on dislocations in austenite
Fine dispersions of intermetallics of Fe, Ni, Ti etc
A fine, highly dislocated and strong martensite

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