Find the logarithm of 0.001 to the base 10.

Let,

⇒ log₁₀ (0.001) = x

⇒ (10)^x = 0.001

⇒ $10^x = \dfrac{1}{1000}$

⇒ 10^x = $\dfrac{1}{10^3}$

⇒ 10^x = 10^-3

⇒ x = -3.

Hence, required value = -3.