British thermal unit

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unit

 [u´nit]
1. a single thing; one segment of a whole that is made up of identical or similar segments.
2. a specifically defined amount of anything subject to measurement, as of activity, dimension, velocity, volume, or the like.
3. a distinct part of a hospital, usually having a specific physical location and serving a defined function; see under names of specific units.
Ångström unit angstrom.
atomic mass unit (u) (amu) the unit of mass equal to ¹⁄₁₂ the mass of the nuclide of carbon 12. Called also dalton.
autonomous nursing unit a nursing unit under a decentralized administration system in which the staff is responsible for all aspects of unit functioning.
British thermal unit (BTU) a unit of heat formerly widely used, being the amount necessary to raise the temperature of 1 pound of water from 39° to 40°F., equal to approximately 252 calories.
CH50 unit the amount of complement that will lyse 50 per cent of a standard preparation of sheep red blood cells coated with antisheep erythrocyte antibody.
continuing education unit (CEU) a unit of credit for educational offerings given to professional persons, determined by a professional organization according to a mathematical formula after a thorough review of the program of study, the qualifications of the instructors, and the program objectives.
critical care unit intensive care unit.
electrostatic u's (esu) that system of units that is based on the fundamental definition of a unit charge as one that will repel a similar charge with a force of 1 dyne when the two charges are 1 cm apart in a vacuum.
environmental control unit a computerized system that allows the handicapped individual to operate several different appliances using a keyboard or other input device.
heat unit the amount of heat energy that is produced by one kVp (kilovolt peak) and one mA (milliampere) for one second with single phase, full wave rectified radiographic equipment.
Hounsfield unit an arbitrary unit of x-ray attenuation used for CT scans. Each voxel is assigned a value on a scale in which air has a value of −1000; water, 0; and compact bone, +1000.
intensive care unit see intensive care unit.
International unit (IU)
1. a unit of enzyme activity equal to the amount of enzyme that catalyzes the conversion of one micromole of substrate or coenzyme per minute under specified conditions (temperature, pH, and substrate concentration) of the assay method. Abbreviated U.
2. any of several arbitrary units that have been adopted by international bodies to express the quantities of certain vitamins (A, C, D, and thiamine hydrochloride), hormones (androgen, chorionic gonadotropin, estradiol benzoate, estrone, insulin, progesterone, and prolactin), and drugs (digitalis and penicillin).
Kienböck's unit a unit of x-ray exposure equal to 0.1 erythema dose; symbol X.
motor unit the unit of motor activity formed by a motor nerve cell and its many innervated muscle fibers.
postanesthesia care unit (PACU) a specialty unit in a hospital for giving postanesthesia care (care of patients recovering from anesthesia and intravenous sedation); formerly called recovery room.
radiologic u's units used to measure radiation, including roentgens, rads, rems, and curies.
u's of service (UOS)
1. the number of procedures done by a department.
2. individuals or groups of individuals who are the recipients of nursing care.
short procedures unit (short term care unit) a nursing unit where patients are briefly cared for following a medical or surgical procedure and are then discharged without spending the night.
SI unit any unit of the International System of units (the metric system); see also si units.
step-down unit a nursing unit designated to provide care for patients who are stable enough to be discharged from the intensive care unit but are not yet ready to be cared for on a medical-surgical unit.
Svedberg unit (S) a unit equal to 10−13 second used for expressing sedimentation coefficients of macromolecules.
Svedberg flotation unit (Sf) a unit equal to 10−13 second used for expressing negative sedimentation coefficients of macromolecules that float rather than sink in a centrifuge, e.g., lipoproteins.
terminal respiratory unit the functional unit of the lung, including a respiratory bronchiole, alveolar ducts and sacs, and alveoli; called also primary lobule of lung and primary respiratory lobule.
USP unit one used in the United States Pharmacopeia for expressing potency of drugs and other preparations.

Brit·ish ther·mal u·nit (BTU),

the quantity of heat required to raise 1 lb of water from 3.9°C to 4.4°C; equal to 251.996 calorie or 1055.056 J.
Synonym(s): unit of heat (2)

British thermal unit (BTU)

a unit of heat energy. The amount of thermal energy that must be absorbed by 1 lb of water to raise its temperature by 1° at 39.2° F. It is also equivalent to 1055 joules or 252 calories.

British Thermal Unit

An obsolete unit, equal to 252 calories or 1055 Joules, for the amount of energy needed to raise the temperature of one pound of water by one degree Fahrenheit.

British Thermal Unit

A unit of energy–equal to 252 calories or 1055 Joules needed to raise one pound of water by one degree Fahrenheit

Brit·ish ther·mal u·nit

(BTU) (brit'ish thĕr'măl yū'nit)
The quantity of heat required to raise 1 pound of water from 3.9-4.4°C; equal to 251.996 calories or to 1055.056 joules.

British thermal unit

BTU, a unit of heat being the amount necessary to raise the temperature of 1 pound of water from 39 to 40°F, generally considered the equivalent of 252 calories.
References in periodicals archive ?
Janitrol and Hamilton Electric brands primarily for retailers and Goodman and GMC units for distributors span from 4,800 to 23,500 BTUs in 24 models.
It represents the number of BTUs required to raise the temperature of water 1 degree per square foot of surface area.
The Energy Star emblem is on 37 machines, including the new Compact Programmable series, 5,000 to 12,000 BTUs, with remote electronic controls.
But a BTU tax is a lot simpler in theory than in execution.
As a source of revenue in the Clinton plan, the BTU tax would be second only to the proposed changes in personal income tax rates.
Fedders' line, 5,000 to 32,000 BTUs, comes with more electronics and less bulk.
Five portables from 7,500 to 8,300 BTUs electronically control air conditioning, dehumidifying, fan operation and electric heating.
Five De Luxe models range from 5,200 to 17,500 BTUs.
Sharp has eight models from 5,000 to 12,000 BTUs, all different from this year.
The step-up PAC-290 is rated at 7,500 BTUs for uninterrupted use without water or 8,500 BTUs for eight hours of "super-cooling" when filled with water.
The Frigidaire brand has 14 air conditioners, 5,000 to 25,000 BTUs, and four dehumidifiers.
Compact models are the GAC053T7A, 5,200 BTUs and 8.