Answers

2015-10-04T10:55:27+05:30
Scalars are quantities that are fully described by a magnitude 

Vectors are quantities that are fully described by both a magnitude and a direction.



Thrust has both magnitude and direction so it is called vector quantity. 
Pressure has magnitude only thats why it is called scalar quantity.




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2015-10-04T11:09:04+05:30
Because thrust has both magnitude and direction[vector quantity].but pressure has only magnitude.[scalar quantity]
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