The unit of surface roughness is usually

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BlackTom AI · Accepted Answer

The question asks: The unit of surface roughness is usually

Option A: mm — This unit is millimeters. Surface roughness values are typically much smaller than millimeters, so using mm would be inappropriate for characterizing roughness magnitudes that are usually in the micrometer range. This option misrepresents the common scale of roughness measurements.

Option B: μm — This is micrometers. In engineering and materials science, surface roughness parameters (such as Ra) are commonly reported in micrometers because roughness features on finished surfaces generally fall within the micrometer scale. This aligns with standard practice for many machined or polished surfaces.

Option C: nm — This is nanometers. While nanometer-scale roughness can be relevant for very smooth or specialized surfaces, general surface roughness is typically not expressed in nanometers for everyday engineering measurements because the values are often larger than a few nanometers. This option can be correct for ultra-smooth contexts but is not the usual default unit across common applications.

Option D: dm — This is decimeters. This unit is far too large to meaningfully describe surface texture roughness, which occurs on scales far smaller than a decimeter. Using dm would obscure the actual roughness features.

In summary, the most conventional and widely used unit for reporting surface roughness in standard contexts is micrometers (μm), since it appropriately matches typical roughness magnitudes and established measurement conventions. The other units either overstate or understate the scale for common surfaces, or are inappropriate for texture characterization in routine practice.

BK10A6101 Technical Documentation and 3D Modeling - Monimuoto-opetus 2.9.2024-20.4.2025 Individual Exercise 4

The unit of surface roughness is usually

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BK10A6101 Technical Documentation and 3D Modeling - Monimuoto-opetus 2.9.2024-20.4.2025 Individual Exercise 4

The unit of surface roughness is usually

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表面粗糙度代号标注中，用____参数时可不注明参数代号

Which of the following descriptions is correct?

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更多留学生实用工具

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在表面粗糙度的评定参数中，能充分反映表面微观几何形状高度方面特性的是（）