SI Units Flashcards

1
Q

What are the 7 SI units?

A

Seconds
Metres
Mols
Amperes
Candela
Kg
Kelvin

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2
Q

What is a second?

A

Duration of a certain amount of oscillations of a caesium 133 atom

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3
Q

What is a mol?

A

The amount of substance that has the same amount of particles as there are atoms in 0.012kg (12g) of carbon 12

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4
Q

What is a metre?

A

Length travelled by light in a vacuum in 1/300 000 000 of a second

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5
Q

What is an ampere?

A

The current in 2 parallel conductors of infinite length placed 1m apart in a vacuum that would produce a force of 2x10-7 N/m

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6
Q

What is a candela?

A

The luminous intensity of monochromatic light

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7
Q

What is a Kelvin?

A

1/273.16 of the thermodynamic triple point of water

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8
Q

What are the SI prefixes for 10-12, 10-9, 10-6, 10-3, 10-2, 10-1, 10 +1 etc?

A

Pico, nano micro, milli, centi, deci

Deca, hecto, kilo, mega, Giga, tera

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9
Q

What units do we use to note speed?

A

m.s-1

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10
Q

What units do we use to note velocity?

A

m.s-1 with direction

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11
Q

What units do we use to note acceleration?

A

m.s-2

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12
Q

What units do we use to note current density?

A

A.m2

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13
Q

What unit do we use to measure energy?

A

Joules J

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14
Q

What unit do we use to measure power?

A

Watt W

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15
Q

What unit do we use to measure charge?

A

Coulomb C

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16
Q

What unit do we use to measure capacitance?

17
Q

What unit do we use to measure inductance?

18
Q

What unit do we use to measure magnetic flux?

19
Q

What unit do we use to measure magnetic flux density?

20
Q

How do we change Celsius into Kelvins?

A

Add 273.15 e.g. 1c = 274.15k

21
Q

What units do we use to measure newtons?

22
Q

What units do we use to measure pascals?

A

Kg.m-1.s-2

23
Q

What units do we use to measure joules?

24
Q

What unit do we use to measure Ohms?

A

Kg.m2.s-3.A-2

25
How do atmospheres, kPa and bar’s compare to each other at sea level?
1 atmosphere (average pressure at sea level) = 101.3kpa = 1.013 bar I.e. 1 atm = 100kpa = 1 bar
26
How does one atm compare to: PSI, mmHg and cmH2O?
1 atm = 14.69 PSI = 760mmHg and 1033 cmH2O
27
How does 1kpa compare to cmH2O and mmHg?
1kpa = 10.3cmH2O and 7.6mmHg
28
Ampere gives the quantity of……?
Electrical current
29
Kg gives the quantity of…..?
Mass
30
How can you change cmH2O to mmHg?
Multiple by 0.76
31
What is a googol?
Prefix for 1x10 to the power of 100
32
What is the prefix Tera in numbers?
1 000 000 000 000
33
What is the prefix pico in numbers?
0.000 000 000 001
34
How do we change mmHg to kPa?
Divide by 7.6