Measurements 8 Flashcards
Nautical mile
1852 miles
Conductance unit
Mho
1 cubic metre = how many lites
1000
1 bar = how many pascals
10*5
1 torr is equal to
1 mm of Hg
1 atm = how many pascals
1.013 x 10*5 pascals
1 atm = how many mm of Hg
760
1 Amstrong is how many meters
10*-10
Power S.I unit
Watt
Capacitance S.I. unit
Farad (F)
7 fundamental quantities
M E T2 A L2
M - Mass
E - Electric current
T - thermodynamic temperature
- Time
A - Amount of substance
L - luminous intensity
- length
Magnetic flux unit
Weber (W)
Inductance unit
Henry (H)
Magnetic Induction unit
Tesla (T)
Unit of capacitance
Farads
In physics, the weber is the SI unit of magnetic flux. A flux density of one Wb/m2 (one weber per square metre) is one tesla.
Read
Electrostatic induction is an
Electrostatic influence
Kerosene relative density
.8
Mercury relative density
13.6
Glass relative density
2.5
Copper relative density
8.9
Gold relative density
19.3
Metre standard definition
Length of a platinum - iridium rod at 0°C in paris
Or
1/10 million of the distance from pole to the equator
One kilogram definition
Mass of a certain lump of platinum - iridium in Paris
One second definition
Time taken by a Celsius atom (133) to complete 9.1 billion vibrations (estimated)
Least count of an instrument
Smallest measurement that the instrument can make accurately
The error of we do not place our eyes directly in front of the scale u are measuring
Parallax error
Vernier calliper is
An instrument used for measuring objects
No of scales in vernier calliper
2
Main scale
Vernier scale which slides on the main scale
Unit named after a scientist should not be
Written starting with a capital letter if full name is written
Symbols for units never take
Plural form
1 ATM in dynes / cm*2
1.013 x 10 raised to 6
Radioactivity units
curie (Cu)
rutherford (Rd)
Radioactivity of any substance is measured in
Disintegration per second
1 rutherford (Rd) =
10*6 disintegration per second.
1 curie (Cu) =
3.7 x 10*10
1 horse power =
746 watt
No of supplementary qty
2
Supplementary qty
Plane angle - radian
Solid angle - steradian
Radian vs degrees
Radian is SI unit
180° = 1 pie
farad vs faraday
farad - unit of capacitance
faraday - unit of charge
1 faraday equal to charge of
6.02 x 10*23 electrons ( Avogadro’s no )
Electron volt
a unit of energy equal to the work done on an electron in accelerating it through a potential difference of one volt.
Largest unit of mass
CSL
Chandra Shekhar limit
1 CSL =
1.4 times the mass of sun
Smallest unit of energy
Electron volt (e.v.)
Biggest unit of charge =
Faraday
1 faraday = 96500 coulomb
1 coulomb is the charge of
6.25 x 10*18
Work =
Force x displacement x cos θ
where θ represents the angle between force applied and displacement
Kilowatt per hour -
Unit of energy (kWh)
No of ergs in 1 kWh
36 trillion
