types:
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acceleration
(physics) a rate of increase of velocity
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deceleration
(physics) a rate of decrease in velocity
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attrition rate, rate of attrition
the rate of shrinkage in size or number
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birth rate, birthrate, fertility, fertility rate, natality
the ratio of live births in an area to the population of that area; expressed per 1000 population per year
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bits per second, bps
(computer science) the rate at which data is transferred (as by a modem)
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crime rate
the ratio of crimes in an area to the population of that area; expressed per 1000 population per year
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data rate
the rate at which circuits or other devices operate when handling digital information
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death rate, deathrate, fatality rate, mortality, mortality rate
the ratio of deaths in an area to the population of that area; expressed per 1000 per year
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dose rate
the quantity of radiation absorbed per unit time
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ESR, erythrocyte sedimentation rate, sed rate, sedimentation rate
the rate at which red blood cells settle out in a tube of blood under standardized conditions; a high rate usually indicates the presence of inflammation
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flow, flow rate, rate of flow
the amount of fluid that flows in a given time
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flux
the rate of flow of energy or particles across a given surface
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frequence, frequency, oftenness
the number of occurrences within a given time period
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GHz, Gc, gigacycle, gigacycle per second, gigahertz
1,000,000,000 periods per second
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growth rate, rate of growth
the rate of increase in size per unit time
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Hz, cps, cycle, cycle per second, cycles/second, hertz
the unit of frequency; one hertz has a periodic interval of one second
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inflation rate, rate of inflation
the rate of change of prices (as indicated by a price index) calculated on a monthly or annual basis
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jerk
(mechanics) the rate of change of acceleration
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kHz, kc, kilocycle, kilocycle per second, kilohertz
one thousand periods per second
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kilometers per hour, kilometres per hour, km/h, kph
the ratio of the distance traveled (in kilometers) to the time spent traveling (in hours)
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MHz, Mc, megacycle, megacycle per second, megahertz
one million periods per second
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THz, terahertz
one trillion periods per second
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metabolic rate
rate of metabolism; the amount of energy expended in a give period
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miles per hour, mph
the ratio of the distance traveled (in miles) to the time spent traveling (in hours)
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gait, pace
the rate of moving (especially walking or running)
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heart rate, pulse, pulse rate
the rate at which the heart beats; usually measured to obtain a quick evaluation of a person's health
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rate of return
the amount returned per unit of time expressed as a percentage of the cost
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rate of respiration, respiratory rate
the rate at which a person inhales and exhales; usually measured to obtain a quick evaluation of a person's health
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rev, revolutions per minute, rpm
rate of revolution of a motor
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sampling rate
(telecommunication) the frequency of sampling per unit time
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solar constant
the rate at which radiant solar energy is received at the outer layer of the earth's atmosphere
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spacing
the time between occurrences of a repeating event
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speed, velocity
distance travelled per unit time
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pace, tempo
the rate of some repeating event
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words per minute, wpm
the rate at which words are produced (as in speaking or typing)
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audio, audio frequency
an audible acoustic wave frequency
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radio frequency
an electromagnetic wave frequency between audio and infrared
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infrared, infrared frequency
the infrared region of the electromagnetic spectrum; electromagnetic wave frequencies below the visible range
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angular acceleration
(physics) the rate of change of the angular velocity of a rotating body
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angular velocity
(physics) the rate of change of the angular position of a rotating body; usually expressed in radians per second or radians per minute
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BMR, basal metabolic rate
the rate at which heat is produced by an individual in a resting state
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wave number
the reciprocal of the wavelength of a wave
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centripetal acceleration
the acceleration toward the center that holds a satellite in elliptical orbit
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cardiac output
the amount of blood pumped out by the ventricles in a given period of time
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isometry
the growth rates in different parts of a growing organism are the same
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femoral pulse
pulse of the femoral artery (felt in the groin)
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radial pulse
pulse of the radial artery (felt in the wrist)
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ROI, return on invested capital, return on investment
(corporate finance) the amount, expressed as a percentage, that is earned on a company's total capital calculated by dividing the total capital into earnings before interest, taxes, or dividends are paid
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Nyquist rate
(telecommunication) the lowest sampling rate that will permit accurate reconstruction of a sampled analog signal
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quick time
a normal marching pace of 120 steps per minute
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double time
a fast marching pace (180 steps/min) or slow jog
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airspeed
the speed of an aircraft relative to the air in which it is flying
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escape velocity
the minimum velocity needed to escape a gravitational field
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groundspeed
the speed of an aircraft relative to the ground
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hypervelocity
excessive velocity
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muzzle velocity
the velocity of a projectile as it leaves the muzzle of a gun
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peculiar velocity
velocity with respect to the local standard of rest
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radial velocity
velocity along the line of sight toward or away from the observer
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c, light speed, speed of light
the speed at which light travels in a vacuum; the constancy and universality of the speed of light is recognized by defining it to be exactly 299,792,458 meters per second
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steerageway
(nautical) the minimum rate of motion needed for a vessel to be maneuvered
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terminal velocity
the constant maximum velocity reached by a body falling through the atmosphere under the attraction of gravity
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attendance
the frequency with which a person is present
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count per minute, counts/minute
frequency per minute
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sampling frequency
(telecommunication) the frequency of sampling a continuously varying signal
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infant deathrate, infant mortality, infant mortality rate
the death rate during the first year of life
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neonatal mortality, neonatal mortality rate
the death rate during the first 28 days of life
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M.M., beats per minute, bpm, metronome marking
the pace of music measured by the number of beats occurring in 60 seconds
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channel capacity
the maximum data rate that can be attained over a given channel
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neutron flux
the rate of flow of neutrons; the number of neutrons passing through a unit area in unit time
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radiant flux
the rate of flow of radiant energy (electromagnetic waves)