Last Updated：2025/12/31
Sentence
The
usual
method
of
testing
the
respirableness
of
air
suspected
to
be
contaminated
with
carbon
dioxide
is
to
lower
a
lighted
candle
into
it;
if
the
candle
goes
out
the
atmosphere
is
poisonous;
if
it
continues
to
burn,
however,
the
air
is
not
necessarily
harmless,
as
a
candle
will
burn
in
an
atmosphere
that
is
dangerous
to
life.
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The usual method of testing the respirableness of air suspected to be contaminated with carbon dioxide is to lower a lighted candle into it; if the candle goes out the atmosphere is poisonous; if it continues to burn, however, the air is not necessarily harmless, as a candle will burn in an atmosphere that is dangerous to life.
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