How is 0.1% of the gauge length determined in the context given?

To determine how 0.1% of the gauge length is established, you first need to understand what the gauge length refers to in a materials testing context, particularly in tensile testing. The gauge length is the portion of the material that is measured during the test to determine elongation or reduction in area.

In this case, if we assume a standard gauge length of 50 mm, calculating 0.1% of this length involves a simple calculation:

1. Start with the gauge length: 50 mm.

2. Calculate 0.1%:

• 0.1% as a decimal is 0.001.

• Multiplying this by the gauge length: 50 mm × 0.001 = 0.05 mm.

Therefore, 0.1% of the gauge length when the gauge length is 50 mm is indeed 0.05 mm. This calculation demonstrates how specific percentages are quantified in relation to a known measurement, allowing for precise evaluation in materials testing situations.