Physical Quantities and Units

Physical Quantity

Last week one of the Interesting Things about the Universe is Sputnik V, the first man-made satellite in space. You can get the Sputnik V satellite site at Wikipedia. One thing I read about the Sputnik V press conference with Yuri Grigorovich was this:

The press of Sputnik 5 introduced a new awareness of what was happening in outer space. There would be no living organism that could make a measurement of its own death which could still be observed…. There would be no organism with no capacity to weigh itself…. the world has changed, and all the organs of the organism have begun to experiment with the external environment.

Every organism knew how to calculate the masses and volumes of living things, which had been on the surface of the earth for millions of years. They knew how to measure the quantities of metals, minerals, etc. Any organism that came into contact with the oxygen had figured out to breathe it. They were incredibly knowledgeable about their environment. Every organism knew about life in the environment that they were exposed to.

“A population of humans who cannot live and thrive in the world has an independence of comprehension which hardly any species can afford, or even construct is possible.” (Spencer, 2007)

In other words, everything from this Sputnik V press conference was engineered to say that the world has changed. Everything that was visible to the earthlings has changed. I guess we were just born at a different time in the evolution of what we call our lives.

Also, we would have to come up with a different title for this piece. How would this rank? There are countless alternatives that you can come up with.

List of Physical Quantity

Sr No.

Quantity

Symbol

Value

1)

Acceleration due to gravity

g

 9.8 m/s²

2)

Density of Air

 ρa

1.293 kg/m³ 

3)

The density of Water at 4 C

 ρw

 10³ kg/m³

4)

Density of Mercury

ρm

 13.6 x 10³ 

kg/m³

5)

Mass of electron

 me 

 9.1 x 10−31 

kg

6)

Mass of proton

 mp

 1.672×10−27 

kg

7)

Mass of neutron

 mn

 1.674 x 10−27 

kg

8)

Charge on electron

e

 -1.6 x 10−19  

 C

9)

Charge on proton

e

 1.6 x 10−19 

C

10)

Speed of light in vacuum

c

 3 x 10⁸ 

m/s

11)

Speed of sound in air at NTP

v

 332 m/s

12)

Specific heat of water

 cw

 1 cal/g/°C

13)

Universal gravitational constant

G

 6.67 x 10−11 

 N/m² kg−2

14)

Universal gas constant

R

 8.31 J/mole/K

15)

Avogadro’s number

N

 6.023 x 10²³

 /mole

16)

Boltzmann’s constant

k=R/N

 1.38×10−23 

JK−1

17)

Planck’s constant

h

 6.67×10−34

 Js

18)

Refractive index in air

 μa

 1

19)

Refractive index in water

 μw

 133

20)

The dielectric constant of air

  Ka

 1

21)

The dielectric constant of water

Kw 

 81 (nearly)

22)

The absolute permittivity of free space

 ε0

  8.85×10−12 

Fm−1

23)

The absolute permittivity of free space

μo

 4π x 107  N/m                 

24)

Mass of earth

Me

 6 x 10²⁴ kg

25)

Mass of moon

 Mm

 7 x 10²² kg

26)

Mass of sun

 Ms

 2 x 10³⁰ kg 

27)

Radius of earth

 Re

 6.4 x 10⁶ m

28)

Mass universe

 Mu

 10⁵³

29)

Radius of universe

 Ru

 10²⁶

30)

Mechanical equivalent of heat

J

 4.2 J/cal

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