Question

Write the number in scientific notation.Thickness of a Soap Bubble: $0.0000001$ meter

Short answer

The number $0.0000001$ meter in scientific notation is $1\times {10}^{-7}$ meter.

Step-by-step solution

Identifying the magnitude of the number

Observe that the given number $0.0000001$ is a very small decimal less than 1, and it's positive. The given number has 7 zeros after the decimal point before a non-zero digit appears.

Writing the number as the product of two factors

The first factor in the scientific notation is the digit term, which is taken from the non-zero digits of the original number. The second factor is a power of 10, where the exponent shows the number of places the decimal point was moved. Here, the digit term is $1$, and since the decimal point was moved 7 places to the right to get 1 from 0.0000001, the power of 10 will be ${10}^{-7}$. Therefore, the number in scientific notation will be written as $1\times {10}^{-7}$.

Key concepts

Magnitude of a Number

Understanding the magnitude of a number is essential for grasping scientific notation. Essentially, the magnitude reflects how big or small a number is, and it's determined by counting how far the number is from zero. In the provided example, the thickness of a soap bubble is a very small number, specifically, 0.0000001 meters. The magnitude of this number is small because it's, in essence, a fraction of a whole. Scientific notation helps us to express such small (or even very large) magnitudes in a more manageable form, allowing us to quickly understand the scale of the number at a glance.

To determine the magnitude of a number, look at the number of places you need to move the decimal point to get a number between 1 and 10. Here, for 0.0000001, we move the decimal point 7 places to the right. Therefore, the magnitude represented in scientific notation is related to the power of 10 used, which in this case is ${10}^{-7}$. This informs us that the magnitude is very small, and we are dealing with a minuscule measurement.

Decimal Places

Understanding decimal places is crucial when converting numbers to scientific notation. In the exercise, we are told that the soap bubble's thickness is 0.0000001 meters. Here, the decimal places are represented by the number of zeros that follow the decimal point before reaching the first significant digit. In this case, there are seven decimal places.

However, in scientific notation, large strings of zeros are avoided by creating a shorthand. The process involves shifting the decimal point until only one non-zero digit is to the left of the decimal. This single digit, followed by the appropriate power of 10, succinctly represents the number of decimal places moved. In our example, moving the decimal seven places transforms the number into a cleaner expression: $1\times {10}^{-7}$. This highlights the original seven decimal places but in a much more convenient and standardized form.

Powers of 10

The concept of powers of 10 is a cornerstone of scientific notation. It involves using 10 raised to an exponent to signal the number of places the decimal point has been moved. The exponent can be positive or negative, indicating large or small numbers, respectively. The base of 10 is chosen because our numeral system is decimal, meaning it is based on the number 10.

In the example given, $0.0000001$ meters becomes $1$ when the decimal point is moved 7 places to the right. To maintain the value of the original number, this shift is counterbalanced by the power of 10. A shift to the right (for small numbers) involves a negative exponent: $1\times {10}^{-7}$. Conversely, shifting the decimal point to the left (for large numbers) requires a positive exponent. This presentation as a power of 10 allows any number, no matter how extreme, to be expressed compactly and consistently. Powers of 10, therefore, become vital when communicating scientific data across disciplines.