Monday 17 April 2017

A CYLINDER IS MADE UP OF WHICH METAL ?

The cylylinders must be strong enough with high thickness to hold the high pressure gases ( many times high compared to atmospheric pressure ).
As per the physical, chemical nature of the gases that are to be filled in the cylinders, they will be made up of various substances,and shapes  .We will have liquid propane or butane in our domestic cylinders.
these cylinders are made up of special stainless steel that doesn't allow the rust to itself. The Thickness will be maintained from 1 centimetre  to 1 inch.
These gas cylinders are  in usage since the industrial revolution of 19th century.

Wednesday 12 April 2017

AKASHAM LO AKSHARALU YELA RASTHARU?/ HOW LETTERS WILL BE WRITTEN IN THE SKY?

With the help of aeroplanes we can write the letters,words in the sky.This is known as " sky writing ". This is invented by John c sevage.
First time in the England they wrote " daily mail " in the sky, and in the New York they wrote " hello sa".For this sky writing they use paraffin oil that mixed in the smoke of aeroplane comes from its back side.