# Please tell me why thrust is vector quantity while pressure (thrust per unit area) is scalar quantity

2
by Soukhyu

2014-11-26T21:54:09+05:30
Pressure is defined as force per unit area. Since pressure has no direction and they are compared only in the terms of their magnitude, so it is considered as a Scalar quantity. Whereas Thrust is the force acting on a body perpendicular to its surface. Since thrust is defined in the terms of both direction(as it is only applicable to the body perpendicular to its surface) and magnitude, so it is considered as a Vector quantity.
a vector quantity is a quantity is quantity in which we there is magnitude and direction both therefore in thrust as thrust is a force it is applied perpendicularly to surface in contact in which the direction is mentioned but i pressure it is not because it has no direction but it has magnitude therefore pressure is a scalar quantity
het. see my answer for the reason why pressure is not a vector. u have not explained that. thanks
ok!
2014-11-29T07:29:34+05:30

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Force is a vector quantity as the forces follow the parallelogram law of addition of vectors. (or, the triangle law of addition).  Thrust is a component of force acting on a body in the direction perpendicular to the surface of the body or fluid.  Thrust follows vector addition rule.

Pressure does not follow this vector addition rule.  That is why pressure is not treated as a vector.  It is treated as a scalar.

In a liquid or in a gas, there is a weight of a column of fluid acting on the layer below it, this is the weight.  It has a definite direction, vertically downwards.

In a liquid or in a gas, the pressure exerted at any point is same in all directions.  Pressure in two directions do not add like forces in two directions.

There is no component of pressure to be calculated for any direction.  But for a force , we calculate the component along other directions.