![]() But they are different numbers and sometimes it does matter. Now, in common usage it often does not matter whether the intent was 1000 bytes or 1024 bytes. That is 2 10 - a power of two very close to 1000. But in the computer world it often means 1024 bytes. What does it mean? It might seem to mean 1000 bytes, since kilo means 1000. You have probably heard words such as kilobyte, in the context of computers. "A picture is worth about 1.7 zmol of words." Radius of a chlorine atom in Cl 2 ~ 0.1 nm or 100 pmīond energy for one C=C double bond ~ 1 aJ World energy production per year, ~ 0.4 ZJġ light-year (distance light travels in one year) ~ 9.5 Pmġ light-second (distance light travels in one second) ~ 0.3 Gm ![]() prefixĪbbreviation (upper and lower case are important)Ī sense of scale (for some) Most are approximate.Įnergy given off by the sun in 1 second ~ 400 YJ To help you visualize the effect of these prefixes, there is a column "a sense of scale", which gives some examples of the magnitudes represented. In particular, the smaller prefixes such as nano, pico, femto, etc., are becoming increasingly common as analytical chemistry and biotechnology develop more sensitive methods. You will find prefixes from throughout the range as you read the scientific literature. There is no point of memorizing this, but it is nice to have a place to look them up. Our various textbooks and lab manuals contain longer lists of prefixes, but few if any contain a complete list. In introductory chemistry we use only a few of the most common metric prefixes, such as milli, centi, and kilo.
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