Which of the following equations is used for the prediction of activity co-efficient from experiments?

Plasticisers are high boiling liquids added to plastic polymers to impart toughness and flexibility at ordinary temperature. Which of the following is not a plasticiser?

High alumina refractory compared to fireclay bricks have________?

In which mode of heat transfer, the Biot number is important?

Ore concentration by froth floatation utilises the ________ of ore particles?

Which of the following is the softest material?