PPM is an acronym that frequently appears in the learning process or in daily life. However, many people still do not understand exactly what PPM is. What does it mean? When to use and how to use it? The following article will bring useful information to help you understand PPM knowledge.
PPM has three main meanings that are commonly used:
These three meanings are applied in 3 completely different fields. Therefore, when finding out what PPM is, you need to put PPM in each specific case and context.
However PPM is used in unit is used more commonly. it is used in a number of related disciplines. Accordingly, PPM stands for Parts Per Million. Significantly is one millionth (ingredients per million units). For example: A rare gas like helium takes 1 million molecules of air to have 1 molecule of helium. The specific formula of PPM is as follows:
|1ppm = 1 / 1,000,000 (i.e. one millionth)|
This is a unit for measuring very low, extremely low volume, volume. Therefore it is only used to measure metals, rare gases for relatively low densities. Therefore, it is very easy to find PPM silently in chemistry and related jobs. Some days that PPM is often used are chemistry, physics, biology, electronics … Some areas that PPM is used regularly today are mainly related to emissions, environmental pollution.
In some industries, it is required to calculate the ratio of the amount of a substance, to the total amount of the mixture containing it. The quantity here can be the number of particles, volume, mass or some characteristic, depending on the situation. In particular, we will often encounter the PPM unit on a concentration measuring device TDS or in water solids concentration test results.
For example, a dosing pump injects a trace chemical into a main processing line with a flow rate of QP = 125 PPM. Accordingly, we will have the rates expressed in different units of volume. Including 125 µL / L, 125 µgal / gal, 125 cm3 / m3 , …
In nuclear magnetic resonance spectroscopy (NMR), chemical shifts are often expressed in PPM. It denotes the difference of the measured frequency in parts per million compared with the reference frequency. The reference frequency depends on the magnetic field of the device and the element being measured. It is usually expressed in NHz. Typical chemical transformations are rarely several centimeters more than the reference frequency. Thus, chemical shifts are conveniently represented by PPM (or Hz / MHz).
The designation for each PPM part may refer to a mass fraction, a molar part or also a volume fraction. Because normally these indicators do not clearly state the amount used. Therefore, the units should be written as kg / kg, mol / mol, m3/ m3 , …
Accordingly, to distinguish mass from mass or molar fractions. The letter “W” will sometimes be added to the abbreviation. For example: PPMW, PPBW,… In which, W stands for weight.
The use of partial notation (PPM) is generally quite stable in most specific sciences. This leads to some researchers frequently using their own units. Like mol / mol, volume / volume,… or lots of different units.
The calculation example is as follows: An enterprise produces 1.3 million products. In which 2000 products are damaged or defective. Accordingly, the number of products that have defect percentage is (calculated by percentage): 2000/1300000 * 100% = 0.16%. If calculated in units PPM would be: PPM = 2000/1300000 * 1000000 = 1600 PPM.
Because PPM is a unit used to measure density for an extremely low volume, or mass. So PPM units are often used in measuring the amount of substance in a mixture.
PPM is often used in the description of dilute chemical solutions. They are used to test for diversity, abundance in water or solutes. When working with different types of solution, it is usually water. It will usually be assumed that the density of water will be equal to 1g / mL.
In addition, the PPM concentration is used in hydroponics. To measure the ionic density of the nutrients contained therein. In fact, the nutrition in hydroponics is essentially the solution of the nutrients required by the plant. And this solution usually exists in its form ions.
Before, we still often think of units like kg, grams, … These types of units are very popular. However, PPM is also a type of unit used a lot but very few people understand it well. Above is the basic information and easiest to understand what is PPM. Hope the above article will answer questions and useful information about PPM for you.
>> Related Articles:
Source link < What is PPM? When is PPM used? > Healthdrinkshub.com