By definition we have to: Scientific notation, also called pattern or notation in exponential form, is a way of writing numbers that accommodate values too large or too small to be written in a conventional manner. The use of this notation is based on powers of base 10. A number written in scientific notation follows the following pattern: The number m is called "mantissa" and e the "order of magnitude" For this case we have: 0.000007 Using the definition, we have that the measure of the diameter in scientific notation is: Answer: An expression that represents this diameter, in meters in scientific notation is: