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Who invented science

Ans:Most consider Aristotle as the first scientist — in an absolute sense. In the fourth century B.C., Aristotle gave unprecedented theories and developed ideas that shape scientific logic and observation as we know it today.

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What is meant solar system? 

How many components has ecosystem?

What is diapedesis?

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 7,000 lb/hr of aniline is to be heated from 100 to 150 °F by
cooling 10,000 lb/hr of toluene with an initial temperature
of 185 °F in 2- by 1-in IPS double pipe hairpin exchangers
15 ft long. Pressure drops of 10 psi are allowable, and a dirt
factor of 0.005 is required. (b) How many hairpin sections
are required? (c) How shall they be arranged? (c) What is the
final dirt factor?