How do I convert percent to ppm?
Multiply by 10,000. One percent is one part in a hundred, and one ppm is one part in a million, so 1% = 10,000 ppm, 0.1% = 1000 ppm, and 0.0001% = 1 ppm. It is the same ratio expressed against different denominators.
Is mg/L the same as ppm?
For dilute aqueous solutions, yes, and this converter treats them as equal. The equivalence rests on water having a density of about 1 kg per litre, so a milligram in a litre is a milligram in a kilogram, which is one part per million by mass. For seawater, brines, or non-aqueous solvents, the density is not 1 kg/L and the equivalence breaks down.
Does ppt mean parts per trillion or parts per thousand?
In this converter, parts per trillion (10^-12). But the abbreviation is genuinely contested: some sources, particularly older and European ones, use ppt for parts per thousand, which is what per mille means. Whenever you see ppt in a document, confirm which one is intended, because the two differ by a factor of a billion.
Can I convert ppm to mg/m^3 for a gas?
Not here. That conversion needs the substance's molar mass and the temperature and pressure, because ppm for a gas is normally a volume ratio while mg/m^3 is a mass concentration. This tool is a pure ratio converter, so it has no chemistry in it.
What is a real-world sense of scale for ppm and ppb?
One ppm is roughly one minute in two years, or a single drop of water in a 50-litre tank. One ppb is about one second in 32 years. Regulatory limits often live in these ranges: the EU limit for lead in drinking water is 10 micrograms per litre, which is 10 ppb.
Is per mille the same as per cent?
No. Per mille is per thousand, written with the symbol, and it is ten times larger a denominator than percent. 1 per mille is 0.1%, or 1000 ppm. It is used for blood alcohol content in much of Europe and for slopes and gradients in engineering.