Water is colourless. But when we observe any large water body, it appears blue. When it has a lot of impurities (or nutrients), it can vary from red, green, white, grey, brown, black to anything that is weird and filthy. Read about some important terms related to different colours of water that we come across in common parlance or which researchers use to understand better this elixir of life.
Bluewater: ‘Why is water blue in colour?’—humans must have raised this question since time immemorial. But in 1921, this query was resolved when Sir CV Raman raised and answered it successfully...
We keep reading or hearing about air pollution and its deadly effect on our health and environment. More recently, we have also been hearing this new abbreviation being mentioned quite regularly: AQI – or Air Quality Index.
As the name suggests, AQI is nothing but a report on the quality of air that we are breathing in a particular place – it informs us and the authorities how polluted the air is, so that a decision can be taken on the measures to control the pollution level...