**mg**/

**L**=

**ppm**. By definition, a Liter of water weighs

**1**kg (

**1**kilogram or 1000 grams). Therefore

**1 mg**=

**1**/1,000,000 of a kg. So, based on what we have learned:

**1 mg**/

**L**=

**1 mg**/kg =

**1 mg**/million

**mg**=

**ppm**.

Also know, what is the relation between ppm and mg L?

as grams per 1,000 liters, which may be converted to mil-

**ligrams**per liter (mg/L). Therefore, 1 g/m3 = 1 mg/L = 1 ppm. Likewise, one**milligram**per cubic meter (mg/m3) is the**same**concentration in water as one**microgram**per liter (ug/L), which is about 1 ppb.What is 1 ppm?

One liter (L) of pure water at 4ºC and

**1**standard atmosphere pressure weighs exactly**1**kg, so**1**mg/L is**1 ppm**. Another way to say it is a liter of water weighs 1,000 grams or**1**million mil- ligrams. Therefore,**1**mg in**1**liter is l mg in**1**million mil- ligrams or**1**part per million.What is 1 mg kg in ppm?

Handy Metric Conversions

Equivalents | |
---|---|

1 pound (lb) = 453.6 grams (g) | 1 mcg/lb = 2 mg/ton |

1 kilogram (kg) = 2.2 lb = 1.000 g | 1 mg/lb = 2 g/ton |

1 g = 1,000 milligrams (mg) | 1 mg/lb = 2.2 ppm |

1 mg/kg = l part/million (ppm) | 1 mg/lb = 2.2 ppm |