Scale Experiments
Spring Scale
http://physicstasks.eu/930/spring-scale-on-the-pole-and-on-the-equator
“ We calibrated a spring scale on the North Pole and then we moved the scale to the Equator.
Does the spring scale give the same readings as on the pole? Give reasons. ”
Practical calculations for engineers
“ Suppose such a spring balance be made and calibrated in London by suspended weights which are mutiples or sub-multiples of the point weight. Then if the balance and the standard pound weights were taken to different latitudes, it would be found that the balance would show increasing readings for the same weight in passing from the equator to the poles. ”
“ World Distribution of Sea Level Pressure
The atmosphere exerts a pressure of 1034 gm per square cm at sea level. This amount of pressure is exerted by the atmosphere at sea level on all animals, plants, rocks, etc.
Near the equator the sea level pressure is low and the area is known as equatorial low. Along 30° N and 30° S are found the high-pressure areas known as the subtropical highs. Further pole wards along 60° N and 60° S, the low-pressure belts are termed as the sub polar lows. Near the poles the pressure is high and it is known as the polar high. ”
and further down:
“ Polar High Pressure Belt
- The polar highs are small in area and extend around the poles. - They lie around poles between 80 – 90° N and S latitudes.
Formation
- The air from sub-polar low pressure belts after saturation becomes dry. This dry air becomes cold while moving towards poles through upper troposphere. - The cold air (heavy) on reaching poles subsides creating a high pressure belt at the surface of earth. ”