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Reach Chemical and Physical Sciences > Beyond SI Units > Flashcards

Beyond SI Units Flashcards

1
Q

The amount of heat energy needed to raise the temperature of one gram of water by one degree Celsius, equal to 4.184 J

A

calorie

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2
Q

Unit of electric current in the cgs system of units, equal to 10 A

A

abampere or biot

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3
Q

Unit approximately equal to the most probable distance between the nucleus and the electron in a hydrogen atom in its ground state

A

Bohr length

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4
Q

Unit of magnetic flux density in the cgs system of units, equal to 1 x 10-4 T or 100 μT

A

gauss

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5
Q

Unit of length defined as the distance at which one astronomical unit subtends an angle of one arcsecond, approximately equal to 3.26 light-years

A

parsec

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6
Q

Unit of pressure in the cgs system, equal to 0.1 Pa

A

barye

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7
Q

The time it takes the solar system to revolve once around the galactic core, approximately 250 million years

A

galactic year

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8
Q

Unit of time equal to 14 days

A

fortnight

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9
Q

Unit of area equal to (100 m)2, or 10,000 m2

A

hectare

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10
Q

Unit of spectral flux density, used especially in radio astronomy (named for the founder of radio astronomy who in August 1931 first discovered radio waves emanating from the Milky Way)

A

jansky

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11
Q

What does FLOPS as a measure of a computer’s computing power stand for?

A

Floating point Operations Per Second

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12
Q

The mean solar day on the planet Mars

A

sol

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13
Q

Unit for sedimentation coefficient, defined as exactly 10−13 seconds (named for the winner of the 1926 Nobel Prize in chemistry for his work on disperse systems, colloids and his invention of the ultracentrifuge)

A

svedberg

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14
Q

A unit of measurement of the optical power of a lens or curved mirror, which is equal to the reciprocal of the focal length measured in metres

A

diopter

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15
Q

What is 1 astronomical unit in kilometers?

A

150 million km (which equals 150 billion m)

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16
Q

Unit for symbol rate or modulation rate in symbols per second or pulses per second

A

baud

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17
Q

Unit of length equal to 10-10 m

A

ångström

18
Q

Unit of area equal to 10−28 m2 (or 100 fm2), used in nuclear physics for expressing the cross sectional area of nuclei

A

barn

19
Q

Unit of length equal to the distance from Earth to the Sun or about 150 million kilometres

A

astronomical unit

20
Q

The amount of heat energy needed to raise the temperature of one kilogram of water by one degree Celsius, equal to 4184 J

A

Calorie (with a capital C) or kilocalorie

21
Q

What unit of energy is defined to be 4.184 gigajoules?

A

ton of TNT

22
Q

Unit of charge in the cgs system

A

statcoulomb or franklin

23
Q

Unit of length measuring about 9.46 trillion kilometres

A

Light-year

24
Q

What standard unit of mass in astronomy is equal to approximately 2×1030 kg?

A

solar mass

25
Q

A unit of information that most commonly consists of eight bits; historically, the number of bits used to encode a single character of text in a computer

A

byte

26
Q

Unit of mass equal to 1000 kg

A

tonne

27
Q

Unit of volume in the original metric system equal to one cubic metre, invented as a metric analogue to the cord

A

stère

28
Q

What is the area of a hectare in square metres?

A

10 000 m2

29
Q

The original name for the kilogram

A

grave

30
Q

Unit in the cgs system for kinematic viscosity

A

stokes

31
Q

Unit equal to 1 rotation of the Earth relative to fixed stars (approximately 23 hours, 56 minutes, 4 SI seconds)

A

sidereal day

32
Q

Unit of energy in the cgs system, equal to 10-7 J

A

erg

33
Q

The system of natural units based upon the speed of light, the gravitational constant, and the ratio of a photon’s energy to its frequency

A

Planck units (note that the Planck time is sometimes consider to be the shortest measurable time interval and the Planck length the scale of quantum gravity)

34
Q

Unit of acceleration in the cgs system of units

A

galileo

35
Q

The basic unit of information in information theory and computing, representing a logical value that can have only one of two values

A

bit

36
Q

Unit of radioactivity

A

curie

37
Q

Unit of pressure equal to 100 000 Pa or 100 kPa

A

bar

38
Q

A unit of information normally equal to 4 bits, or one half of the common 8-bit byte

A

nibble

39
Q

What unit of energy is equal to 1.602×10−19 joules

A

electronvolt

40
Q

Unit of absorbed radiation dose, defined as 0.01 Gy

A

rad

41
Q

Unit of measurement for the exposure of X-rays and gamma rays, defined as the electric charge freed by such radiation in a specified volume of air divided by the mass of that air

A

röntgen

42
Q

Unit of force in the cgs system, equal to 10-5 N

A

dyne

Reach Chemical and Physical Sciences (15 decks)

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