**1.5 x 10^-5: Understanding Scientific Notation**

In scientific notation, numbers are written in the form of a x 10^b, where 'a' is a number between 1 and 10, and 'b' is an integer. This notation is used to simplify very large or very small numbers.

**Breaking Down 1.5 x 10^-5**

Let's break down the number 1.5 x 10^-5:

- The coefficient 'a' is 1.5, which is between 1 and 10.
- The exponent 'b' is -5, which means the number is very small.

**What Does the Exponent Mean?**

The exponent -5 indicates that the number should be divided by 10 five times. To find the value of 1.5 x 10^-5, we can multiply 1.5 by 10^-5:

1.5 x 10^-5 = 1.5 ÷ 10^5 = 1.5 ÷ 100,000 = 0.000015

**Applications of 1.5 x 10^-5**

A value of 1.5 x 10^-5 is extremely small and is often used in scientific and engineering applications, such as:

**Chemistry:**Concentrations of chemicals in solutions.**Physics:**Measurements of very small distances or quantities.**Engineering:**Calculations involving tiny tolerances or measurements.

**Conclusion**

In conclusion, 1.5 x 10^-5 is a very small number that can be easily written and calculated using scientific notation. Understanding scientific notation is essential in various scientific and engineering fields, where precise calculations are crucial.