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5 Awesome Science experiments

What is the need for smoke particles inside the bottle for this experiment?

A science student takes 100 observations in an experiment. Second time he takes 600 observations in the same experiment .By doing so the possible error becomes:

The metal used for making air crafts and rockets is

The experiment method of teaching science at upper primary level helps in

A physical performs an experiment and taken 200 readings. He repeats the same experiment and now takes 800 readingbs. By doing so

Fuel is consumed in a rocket at the rate of 200 kg//s . What is the thrust experienced by the roket if exhaust gases are ejected at a speed of 45 km//s ?