On the basis of unit of length "zira", we can have a unit of mass too. Mass of one cubic zira water is 125 kg, this is a traditional arabic unit of mass, its called wasq. One wasq is equal to 1000 oqia where one oqia is equal to 125 grams.
Wasq and oqia can easily be seen in daily life. Some examples are:
(1) One wasq is the maximum weight a man, usually a wrestler can have with health.
(2) One wasq is about the maximum mass a man, usually a body builder, can lift.
(3) One wasq is about the mass of grains an average person usually eat in a year, considering 2000 calories per day diet.
(4) One oqia is about the average size of an apple.
(5) One oqia is the maximum amount of grapes a person should eat in a day.
(6) Two oqia is the amount of water/milk/tea/juice/soda etc in an average glass/cup.
(7) One oqia is the mass of a large bullet, the kind that is fired from an airplane.
(8) One oqia by volume, that is, 125 cubic cm, is the volume of one mouth full of a man.
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