1 kg per hectare = 2.24 X ppm
To convert 0.5 percent to parts per million (ppm), you multiply by 10,000. So, 0.5 percent is equal to 5,000 ppm.
To convert parts per billion (ppb) to parts per million (ppm), you divide by 1000. So, 28 ppb is equal to 0.028 ppm.
To convert parts per million (ppm) of a substance to grains per gallon (gpg), you need to know the atomic or molecular weight of the substance. Once you have this information, you can use the formula: gpg = ppm x (atomic/molecular weight/7000).
To convert micrograms per square centimeter (ug/cm2) to parts per million (ppm), you need to know the density of the substance in question. First, you convert ug/cm2 to micrograms per cubic centimeter (ug/cm3) by dividing by the thickness of the material in centimeters. Then, you convert ug/cm3 to milligrams per cubic centimeter (mg/cm3) by dividing by 1000. Finally, you convert mg/cm3 to ppm by multiplying by the density of the substance in grams per cubic centimeter and then by 1,000,000.
1000 ppm = 1 ppb I think equation to convert ppm to ppb is: 1 ppm = 1000 ppb, or 1 ppb = 1/1000 ppm * * * * * Wrong way around, I am afraid. 1000 parts per billion is 1 ppm. To convert ppb to ppm divide by 1000.