Definition of rotary evaporator
(Chem.)
a
device
used
in
laboratories
in
which
a
liquid
is
evaporated
by
reducing
the
pressure
and
applying
heat
,
while
rotating
the
liquid
in
a
vessel
such
as
a
round-bottomed
flask
.
The
reduced
pressure
speeds
the
evaporation
process
and
allows
the
evaporation
to
be
conducted
at
temperatures
lower
than
would
otgherwise
be
possible
,
thus
reducing
decomposition
of
unstable
substances
.
The
rotation
also
serves
to
increase
the
surface
area
from
which
evaporation
takes
place
and
to
reduce
the
effect
of
"
bumping
",
the
sudden
burst
of
vaporization
that
can
scatter
liquid
exposed
to
reduced
pressure
.
See also:
Evaporator
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