# Pressure vs Stress: Differences Between Pressure and Stress

In the piping industry, the term Pressure and Stress are always used and most of the time it creates huge confusion among users as the unit of both Pressure and Stress is the same (Pounds per square inch(PSI) or Newtons per square meter or Pascal). However, Both Pressure and Stress are different. So, the differences between stress and pressure i.e, Stress vs Pressure must be known to clearly understand the terms.

## Pressure Vs Stress

Pressure is an intrinsic property and most of the time related to fluids. It depends on the momentum transfer between the atoms of a liquid or gas volume (molecules constrained inside the volume) on a micro-scale.

While Stress is a consequence of the tendency of a body undergoing arbitrary deformation to spring back to its own reference state; To simplify stress is generated whenever a force is applied to a body to deform it.

In this article, I will list down the major differences between Pressure and Stress in a Tabular format.

## Difference Between Pressure and Stress

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Anup Kumar Dey

I am a Mechanical Engineer turned into a Piping Engineer. Currently, I work in a reputed MNC as a Senior Piping Stress Engineer. I am very much passionate about blogging and always tried to do unique things. This website is my first venture into the world of blogging with the aim of connecting with other piping engineers around the world.

## 7 thoughts on “Pressure vs Stress: Differences Between Pressure and Stress”

1. Ajit thorat says:

Hello sir ,
Please send me pdf notes of NDT-2 level as your post which is very useful to me and my colleages.
Thanking you.
With regards,
Ajit tborat.

2. Junhyo Lee says:

Very good article!!

No.1
It might be easier to understand if explained like this. Pressure is action force on material/area, while stress is reaction force from material/area.

No.9 on stress
Stress is not a vector. It is a tensor. Stress is very good example of tensor. Other example of tensor is electric filed and magnetic field. A tensor is somewhat difficult property to understand comparing to scalar/vector. It is the property that is changed and defined with direction such as sigma_xy, sigma_xx(double subscript).

1. HHS says:

Stress is Tensor and not vector

3. siline says:

pressure can create stresses on the surface expose on the surface

4. PLCs says: