How is the resistance force or tensile yield strength of a metal product expressed?

The resistance force or tensile yield strength of a metal product is expressed in thousands of pounds per square inch, commonly abbreviated as ksi. This unit is used in engineering and materials science to provide a standardized measure of how much force a material can withstand before deforming or breaking under tension.

Using thousands of pounds per square inch allows engineers to work with manageable numbers, especially in large-scale calculations where the values can be quite high. This also provides clarity when communicating the material's strength, as tensile yield strength can vary significantly among different metals and alloys.

The other options do not accurately represent tensile yield strength. Pounds per square inch is a valid measure, but typically engineers prefer to use thousands of pounds per square inch for clarity and convenience. Kilograms per square meter is a unit of pressure rather than tensile strength. Barometric pressure pertains to atmospheric pressure and is not related to the mechanical properties of materials.