वैक्यूम फ्लोटेशन यूनिट (vacuum flotation unit) में, वातित सीवेज (aerated sewage) पर लगाया गया वैक्यूम दबाव हवा के बुलबुलों को किस प्रकार प्रभावित करता है?

Turbidity in water is measured on which standard scale?

Mudball formation in rapid sand filters is the result of:

In a water sample, if 2 mg of platinum cobalt salt is dissolved in 1 litre of distilled water, then the colour produced is equal to: