Answer:
The stress element is that of pressure intensity, and its co-ordinates are most generally expressed in the same metrics as pressure: pascals which is equal to newtons per square meter (N/m^2). And in the International System or in the Imperial System it expressed in pounds per square inch (psi)
Step-by-step explanation:
Stress is a physical quantity representing the internal forces exerted on each other by the neighboring particles of a solid substance.
Stress is often expressed by a Greek lowercase letter sigma which is written as 
The stress element is that of pressure intensity, and its co-ordinates are most generally expressed in the same metrics as pressure: pascals which is equal to newtons per square meter (N/m^2). And in the International System or in the Imperial System it expressed in pounds per square inch (psi).
