exa- [EKS uh] +
(Greek: from hexa-, "six"; a decimal prefix used in the international metric system for measurements)
This is a prefix that is used in the metric [decimal] system as one-quintillion [U.S.] or trillionfold [U.K.], 1018 [1 000 000 000 000 000 000]. The metric symbol for exa- is E.
exabit
A unit of information equal to 1000 petabits or 10
18 bits.
A bit is a unit of measurement of information (from Binary + digIT); the amount of information in a system having two equiprobable states: "There are eight bits in a byte".
exabyte
1. A unit of information equal to 1 000 petabytes or 1018 bytes.
2. A unit of information equal to 1 024 pebibytes or 260 bytes.
exagram (Eg)
A unit of mass equal to 1,000,000,000,000,000,000 grams.
exajoule
A measure of energy, symbol EJ; 1018J, equivalent to 1015 Btu.
exasecond (Es)
The age of the universe is estimated to be 0.4 exasecond (12 billion years).
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Source: Chemistry and Molecular Biology Resources, UC Extension, Berkeley/San Francisco
Related "metric" families:
yotta;
zetta;
peta;
tera;
giga;
mega;
kilo;
hecto;
deka;
deci;
centi;
milli;
micro;
nano;
pico;
femto;
atto;
zepto;
yocto.
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