Why is ten always the base for scientific notation?
It's probably in base ten because we use base ten for all our OTHER work in numbers as well. We learn to write numbers in base ten when in elementary school, and use base ten throughout our lives even if we aren't scientists or mathematicians or students or professionals who need to use scientific notation. So keeping scientific notation in base ten makes it easier for everyone to learn and read.
Scientific notation is always written as a number (between 1 and 10) multiplied by a power of ten. For example: 107.6 in scientific notation would be 1.076 x 102 notice how the first number is between 1 and 10 and it is being multiplied by a power of ten. So the example you gave is not written in the same format and is thus not written in scientific notation. If you were to write it…
if the number is written like this, 4.372 x 104 than the number is written in scientific notation, because it is multiplied by ten to the power of something, and the number is less than ten, but 1 or more. if it is written like this than it is not in scientific notation. 43720. scientific notation makes it easier to read.