Question

Convert 40 mm pipe diameter to inches.

Answer

100% (3 rated)

The correct answer is: $1.5748031496\text{ in}$

Explanation

We use the exact conversion factor $1\text{ in}=25.4\text{ mm}$.

Steps:

  1. Convert millimetres to inches: $$\text{inches}=\frac{40\text{ mm}}{25.4\text{ mm/in}}$$
  2. Compute the division: $$\text{inches}=\frac{40}{25.4}=1.5748031496\text{ in}$$
  3. Rounded to a practical number of decimals:
  • To three decimals: $1.575\text{ in}$
  • To two decimals: $1.57\text{ in}$

Therefore, 40 mm ≈ $1.5748\text{ in}$ (about $1.575\text{ in}$).

Note: If you mean nominal pipe size (common plumbing/pipe terms), the nominal inch sizes do not always equal the actual outside diameter; tell me the context if you need the nearest standard pipe size instead.

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