# What are the units of ppb?

## What are the units of ppb?

Parts per billion (ppb) is the number of units of mass of a contaminant per 1000 million units of total mass. Also µg/L or micrograms per liter. More: ppb (or ppbm) is used to measure the concentration of a contaminant in soils and sediments.

Is ppt parts per thousand or trillion?

Although “ppt” usually means “parts per trillion”, it occasionally means “parts per thousand”.

What is the full form of ppb?

PPM and PPB are units used in atmospheric chemistry to describe the concentration of gases. PPM stands for parts of gas per million parts of air, and PPB is parts per billion.

### What’s the best way to practice fractional indices?

Fractional indices March 15, 2019March 15, 2019Craig Barton Author: Matt Baker This type of activity is known as Practice. Please read the guidance notes here, where you will find useful information for running these types of activities with your students. 1. Example-Problem Pair 2. Exercise 1 3. Exercise 2 4. Downloadable version

Which is better a fractional index or a negative index?

Fractional IndicesFractional indices are a bit trickier than negative indices. The example on the right shows how they work very well. Both parts of the fractional exponent have a meaning. The bottom number in the fraction stands for the type of root.

What is the law of fractional indices in Algebra?

Posted in Algebra, Number, Powers and Indices, Simplifying expressionsTagged Algebraic indices, Fractional indices, Law of indices – powers Post navigation Adding and subtracting vectors

#### How to calculate the power of a fraction?

The first step in his example is to flip the fraction around an remove the minus. Then you square root the fraction before calculating it to the power of 4. If you have no problem with this type of expression, you can consider yourself a very accomplished mathematician in the area of fractions and indices. WHERE MATHS IS AT YOUR FINGERTIPS!