# Why do engineers use engineering notation instead of scientific notation?

Engineers commonly use engineering notation because it provides a more practical and convenient way to work with very large or very small numbers in engineering applications. Unlike scientific notation, engineering notation uses powers of 10 that are multiples of three, which align well with the metric prefixes frequently used in engineering calculations.

Additionally, engineering notation allows engineers to quickly interpret and compare values without needing to constantly convert units or decimals. This streamlined approach helps in maintaining accuracy and efficiency in engineering calculations, allowing engineers to focus more on solving problems rather than getting bogged down in number manipulation.

Engineers often prefer to use engineering notation rather than scientific notation for a variety of reasons, which we will explore in this article.

## Understanding Engineering Notation

First, let’s define what engineering notation is. Engineering notation is a version of scientific notation in which the exponent of ten must be divisible by three. Doing so allows for the use of prefixes like milli, micro, kilo, mega, which are very familiar in the physical world.

### Easy Conversion into SI Units

One of the main benefits of using engineering notation is the ease it provides in conversion into SI units. The powers of ten used in engineering notation correspond to the SI prefixes that we use every day in engineering units. For instance, we use kilo for 103, mega for 106, giga for 109, and so on. This compatibility makes it significantly easier to convert units, saving time and reducing the risk of error.

## Engineering vs. Scientific Notation

While similar in many ways, the use of engineering notation rather than scientific notation provides additional advantages beyond easier unit conversion, such as a clearer visual presentation of size and order of magnitude.

### Sense of Scale

Engineering notation gives a better sense of scale and size compared to scientific notation. In this number system, the order of magnitude is visually explicit. This means engineers can see at a glance whether a number is in the tens, hundreds, thousands, or millions. This is not always the case in scientific notation, where the magnitude can be obscured by the notation.

### Comparing Metrics

Engineering notation simplifies comparison between different metrics. For instance, it’s easier to compare microsecs (10-6 seconds) to millisecs (10-3 seconds) than to perform this same comparison in scientific notation. This not only simplifies calculations, but it can also quicken the problem-solving process.

## Leveraging the Benefits of Engineering Notation

There are numerous reasons why engineers typically prefer engineering notation to scientific notation, including easier unit conversion, a better sense of scale, and simpler comparisons. However, the choice of engineering or scientific notation ultimately depends on the context and the engineer’s preference.

### Context is Essential

Choosing between engineering and scientific notation may depend on the context. For example, engineering notation is more valuable in circumstances that involve real-world measurements, while scientific notation may be better suited to abstract calculations, such as those in theoretical physics or pure mathematics.

### Engineer’s Preference

Lastly, one should not discount the importance of habit and preference in the engineer’s choice of notation. Some engineers may be more accustomed or comfortable with engineering notation. After all, the most useful notation is the one that makes solving a problem easier for the individual engineer.

In conclusion, engineering notation’s benefits, combined with their compatibility with SI Units and their utility in visually representing magnitude, makes them the preferred choice for many engineers.

Engineers use engineering notation over scientific notation because it allows for quicker and more practical representation of numbers within the context of engineering and technical applications. The use of engineering notation simplifies calculations, improves readability, and provides a standardized format that aligns with the preferred conventions in engineering disciplines.