# Parts Per Converter

## Parts per Million by Weight in Water

The term "weight" refers to the amount of gas present in ppm of water. The density of water is required to translate this concentration into metric units.

Up until 1969, the density of pure water had to be 1000.0000 kg/m3 at 3.98 °C and normal atmospheric pressure. This was the kilogram's simple definition up until that point. The mass of the kilogram's international prototype defines the kilogramme as it exists today. High purity (VSMOW) water has a density of 999.9750 kg/m3 at 4°C (IPTS-68) and standard atmospheric pressure.

Temperature, pressure, and contaminants, such as dissolved gases or the water's saltiness, all impact the water's density. The density of the solution is being impacted even by the unsettling concentration of gas dissolved in the water. It is possible for water to naturally contain a certain amount of deuterium, which affects the water's density. The isotopic composition is another name for this concentration.

Only after measuring the water's density can accurate conversion calculations be made. Therefore, in actuality, the density of water is fixed to 1.0 103 kg/m3. Using this value to calculate the conversion, you get:

## Parts Per Million (ppm) Converter for Gases

This converter computes the measured value from [ppm] into [mg/m3] and the other way around. Several branches use the ppm unit in various ways. To convert the value to the correct unit, the use of ppm must be indicated in the input fields below. Please refer to the documentation below for more information about ppm usage theory.

You could either select an option from the drop-down list or type the molecular weight of the gas directly into the Molecular Weight input area. Please use our Molecular Weight Calculator if you are unsure of the molecular weight.

Automatic significance determination occurs. The value will be directly converted and displayed in the field at the bottom of the concentration entered in [ppm] or [mg/m3] units. To increase the relevance, add extra zeros.

Try using this PPM calculator if percentages, per mill, and parts per million are still confusing you. It is a straightforward tool for converting PPM units like percent or parts per billion (PPB). We will offer you a brief overview of each proportion indicator in this post and a thorough explanation of how to compute PPM and percentages.