# Which of the following is the smallest unit of measurement?

# a) Millimeter b) Angstrom c) Fermi d) Meter

Millimeter, angstrom, fermi, and meter are different measuring units used to measure the length, height, distance, etc.

## Answer: Option C - Fermi is the smallest unit of measurement.

Let's express each of these units in terms of meter to compare them.

**Explanation:**

We know that,

Meter is the SI unit of length.

1 millimeter = 1/10^{3} meter

1 angstrom = 1/10^{10} meter

1 fermi = 1/10^{15} meter

From the above relationships, it is clear that fermi has the least value.