When the numbers get very big or very small.
A notation is a system of written symbols used to represent numbers, amounts, or elements in something such as music or math. So scientific notation is the system used by scientists to simplify large numbers. And there isn't just scientific notation there's also stuff like electrical notation or musical notation. Hope this helps!
In engineering notation 209 x 10³ or 0.209 x 10^6 would be the most likely used powers of 10. In scientific notation it would be 2.09 x 10^5
It usually isn't. Scientific notation is used for very large and very small numbers, that are not normally used in your daily life. Unless your "daily life" involves work in science or engineering.
Sometimes engineers use either scientific or engineering notation, although you are correct that most of the time engineering notation is used. The reason for this the use if greek letter prefixes for quantities. Very often large and small quantities are expressed as micro, mega, giga, nano, and so on. These terms relate to engineering notation in multiples of 1000 or 1/1000. It is a very convenient shorthand not only in writing but also while speaking.
Sometimes engineers use either scientific or engineering notation, although you are correct that most of the time engineering notation is used. The reason for this the use if greek letter prefixes for quantities. Very often large and small quantities are expressed as micro, mega, giga, nano, and so on. These terms relate to engineering notation in multiples of 1000 or 1/1000. It is a very convenient shorthand not only in writing but also while speaking.Read more: Why_in_engineering_you_use_engineering_notation_instead_of_scientific_notation
Scientific notation is used to compute very large or very small numbers.
Scientific notation is used to compute very large or very small numbers.
Scientific notation used in forensics to compute very large or very small numbers.
Scientific notation is used in jobs to compute very large or very small numbers.
Scientific notation is used when numbers are very large or very small as for example 1,000,000,000,000 is 1.0*10^12 in scientific notation
Scientific notation is used when dealing with very small or very large numbers.
Scientific notation is often used to represent very large and very small numbers. Actually, you can also express a "normal-sized" number in scientific notation. So, whenever there is a number, you may use scientific notation.