How do you write 0.00001 in scientific notation?

To express 0.00001 in scientific notation, follow these steps:

1. **Understand scientific notation:** It is a way of writing numbers as the product of a number between 1 and 10 and a power of 10. The general form is:
```
a × 10^n
```
where `a` is a number between 1 and 10, and `n` is an integer.

2. **Move the decimal point:** Start with 0.00001 and move the decimal point to the right until you have a number between 1 and 10. In this case:
```
0.00001 → 1
```
The decimal point was moved 5 places to the right.

3. **Determine the exponent:** Since you moved the decimal point 5 places to the right, the exponent of 10 will be negative. This is because moving the decimal to the right corresponds to a negative exponent.

4. **Write in scientific notation:** Combine the value of `a` (1) with the power of 10. The result is:
```
1 × 10^-5
```

Thus, 0.00001 in scientific notation is written as **1 × 10^-5**.