The SI unit of 'ultimate stress' is ________.
pascal (Pa)
The SI unit of 'ultimate stress' is pascal (Pa).
Ultimate stress, often referred to as ultimate tensile strength (UTS), is a measure of the maximum stress a material can withstand while being stretched or pulled before breaking. It is expressed as force per unit area. The SI unit for stress is the pascal (Pa), which is equivalent to one newton per square meter (N/m²). As stress is defined as force divided by area, its unit is pressure, which is universally measured in pascals.
Therefore, the correct answer is pascal (Pa).
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