you need
  • basic knowledge of mathematics
term ppm means one thousandth of a substance present in other substances.

example, salinity equal to 0/00 30.0 (ppm) means that one liter of this water contained 30 grams of various salts.
average salinity of seawater is 35 0/00.

In seawater dissolved chlorides 88.7%.This is mainly sodium chloride, i.e. common salt or NaCl.
main method of determining the salinity of sea water - a method titirovaniya.

To determine the salinity of the water in your aquarium with marine life, take away from it in a separate container, for example, 1 liter.

Add water sample to a certain amount of silver nitrate (AgNO3).It connects with silver nitrate and sodium chloride precipitates.

Weigh precipitated silver chloride and, given that the ratio of sodium chloride to other substances is always constant, expect salinity.

However, it will be easier if you have done froze water salinity hydrometer calibrated at room temperature.
With regard to the degree of intoxication, it is also expressed in ppm.

For example, if the device shows the degree of intoxication 0.5 0/00, it means that 1 liter of human blood is dissolved 0.5 g of ethyl alcohol.

At the same amount of alcohol consumed with such a measure in different people is different.The result will depend, firstly, on the floor, and secondly, by weight of the person.

women have the same dose of alcohol as a man, subject to the equality of their weight, the instrument will show a greater degree of intoxication.

This is explained by the fact that the proportion of the male body fluids, including blood, 70% of the total weight, and in the women only 60%.
to calculate for themselves the approximate degree of intoxication in ppm, make a simple calculation:

amount of alcohol consumed in grams multiply on the strength of the drink, and share the results on your body weight by a factor of 0.7 or 0.6.

example: 250 grams of vodka, multiply by 0.4 (40% strength of vodka) and get 100 g
Divide the result by your weight (you are a male weighing 80 kg) and K = 0.7.
100 (80h0.7) = 100: 56 = 1.79 0/00.

Such a result will be directly after taking 250 grams of vodka.