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Critical angle (Optics), that
angle of incidence of a luminous ray at which it is wholly
reflected, and no portion of it transmitted. The sine of this
angle is the reciprocal of the refractive index of the
medium. -- Critical philosophy, the
metaphysical system of Kant; -- so called from his most important
work, the "Critique of Pure Reason." -- Critical
point (Physics), a certain temperature,
different for different gases, but always the same for each gas,
regarded as the limit above which no amount of pressure can
produce condensation to a liquid.

Crit"ic*al*ly, adv.
1. In a critical manner; with nice
discernment; accurately; exactly.

Critically to discern good writers from
bad.

Dryden.

2. At a crisis; at a critical time; in a
situation, place, or condition of decisive consequence; as, a
fortification critically situated.

Coming critically the night before the
session.

Bp. Burnet.

Crit"ic*al*ness, n.
1. The state or quality of being critical,
or of occurring at a critical time.


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