Trick to remember Units of distance

Units of distances (i.e kilometer, metre, centimetre, millimetre) are very confusing.

We get struck at which is greater or smaller and by how much amount it is greater or smaller.

I'll share a trick to remember it easily.

Here it goes like:

Arrange units of distance in decreasing order:

kilometer > hectometre > decametre > metre > decimetre > centimetre > millimetre

    km            hm               dcm            m            dm              cm            mm

These distances are related as: 
1 kilometre (km) = 10 Hectometres (hm)

1 Hectometre (hm) = 10 Decametres (dcm)

1 Decametre (dcm) = 10 Metres (m)

1 Metre (m) = 10 Decimetres (dm)

1 Decimetre (dm) = 10 Centimetres (cm)

1 Centimetre (cm) = 10 Millimetres (mm)


Remember this decreasing order as:

King Henry Died a Miserable Death Called Measles.

I think, it is quite easy to remember this. 

How to remember Periodic Table

To memorize the lengthy periodic table is a very tough task. 

I'll give you a trick to remember periodic table elements groupwise.

1^st group elements (down the column)

 H      Li       Na          K         Rb           Cs          Fr

HeLeN KabR Se Farar.

2^nd group elements (down the column)

 Be       Mg           Ca         Sr            Ba         Ra 

Beta Maange Kanya Sundar Baap Raazi

13^th group elements (down the column)

 B      Al             Ga            In              Tl

BAl Gangadher Tilak

14^th group elements (down the column)

 C             Si            Ge            Sn                  Pb

College Student Gets Some Problem

15^th group elements (down the column)

 N               P               As             Sb               Bi

News Paper me Aaj Sab Bikta hai

16^th group elements (down the column)

O              S                  Se             Te        Po

Old Style Se TeePo

17^th group elements (down the column)

 F             Cl     Br     I   At

Face CBI At ur home

  

18^th group elements (down the column)

He       Ne              Ar       Kr        Xe        Rn

Hai Nana patekar Aaj Ka Zinda Raja

Pressure Belts and Winds

Pressure Belts and Winds

Atmospheric pressure at sea level MORE

Atmospheric pressure on the mountains LESS

when Temperature is LOW Pressure is HIGH.

There are three pressure belts:

1. Equatorial Low Pressure Belt (Doldrums)

2. Tropical High Pressure Belt (Horse Latitudes)

[Here, the pressure is high although high temperature because here pressure depend on the rotation and movement of air]

3. Sub Polar Low Pressure Belt

5° N to 5° S	Doldrums
5° to 30° N and S	Trade Winds
30° to 40° N and S	Horse Latitudes
35° to 60° N and S	Westerlies
60° to 65° N and S	Sub Polar Low Pressure Belt

Calculate time using longitudinal position of the place

lines of longitude

Q. What are longitudinal lines?
Ans. Longitudinal lines are imaginary vertical lines over the Earth's globe.



0° longitudinal line is Greenwich Prime Meridian.
180° longitudinal line is International Date Line.

lines of latitude

Q. What are latitudinal lines?
Ans. Latitudinal lines are imaginary horizontal lines over the Earth's globe.


0° longitudinal line is Equator.




Earth completes one rotation on its axis in 24 hours and in the process turns a complete circle of 360°. This means Earth rotates 360°/24 = 15° in one hour.

Difference of time for 15° longitude = one hour.
Difference of time for 1° longitude = 4 minutes.






Q. Calculate the time at 74° W longitude (New York) when it is 12 a.m. at 82½° E longitude (India)?
Ans. longitude of India = 82½° 
longitude of New York = 74° 
Difference in longitude = 82½° - (-74°) = 156½°
Difference of time for 1° longitude = 4 minutes
Difference of time for 8½° longitude = 4*(156½) = 626 minutes OR 626/60 = 10 hours 26 minutes
As New York is in the west of India, the time at New York will be less than India
Therefore Time of New York = 12 - 10.26 = 01:34 p.m.

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