Glad that you asked. (I just read a book about measuring units.) There are 1,000,000,000,000 picoliters in one liter. A feptoliter, attoliter, zeptoliter, and yoctoliter are all smaller than a picoliter. These units are so darn small that it is hard to find out the answer. 4th grader, Lillian Nguyen
A microliter (one-millionth of a liter).The first ten prefixes on the small side of the prefix list are :deciliter (one tenth of a liter)centiliter (one hundredth of a liter)milliter(one thousandth of a liter)microliter(one millionth of a liter)nanoliter (one billionth of a liter)picoliter (one trillionth of a liter)femtoliter (one quadrillionth of a liter)attoliter (one quintillionth of a liter)zeptoliter (one sextillionth of a liter)yoctoliter (one septillionth of a liter)