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A single dose of LSD is typically between 40 and 500 micrograms—an amount roughly equal to one-tenth the mass of a grain of sand. Threshold effects can be felt with as little as 25 micrograms of LSD. [143] [144] The practice of using sub-threshold doses is called microdosing. [145]
The 1992 study found the maximum safe dietary selenium intake to be approximately 800 micrograms per day (15 micrograms per kilogram body weight), but suggested 400 micrograms per day to avoid creating an imbalance of nutrients in the diet and to accord with data from other countries. [137]
The practice of using grams or ounces depending on the size is also common in states that have legalized marijuana. For example, California allows possession of "an ounce" (legally rounded to 28.5 g) of recreational marijuana but only 8 g of concentrate. [78] The strength of a tab of LSD is almost always expressed in micrograms. [citation needed]
7.192 g/cm 3 [3] when liquid ... (1–13 micrograms per serving). [13] [106] The chromium content of food varies widely, ... (dry weight), increased weight gain. At ...
Experimental measurements of its density give values between 11.5 and 11.66 g/cm 3: these are slightly lower than the theoretically expected value of 11.7 g/cm 3 calculated from thorium's lattice parameters, perhaps due to microscopic voids forming in the metal when it is cast. [11]