The addition of gypsum to cement clinker is done to: MCQ with Answer and Explanation

Explanation:
Boyle's Law states that for a fixed mass of gas at constant temperature, pressure is inversely proportional to volume (P ∝ 1/V, or PV = constant). As volume decreases, gas molecules hit the container walls more frequently, increasing the pressure exerted by the gas.

Explanation:
PVC is a good electrical insulator, resistant to chemicals, water, and fire (self-extinguishing due to chlorine content), making it suitable for cable insulation, pipes, and medical tubing. It is not biodegradable. Flexibility is achieved by adding plasticizers, otherwise rigid. It is an addition polymer of vinyl chloride. Unplasticized PVC (uPVC) is used in construction.

Explanation:
Ozone (O₃) is a powerful disinfectant that decomposes to oxygen, leaving no toxic residues or taste. Chlorination can form carcinogenic trihalomethanes (THMs) with organic matter. However, ozone is more expensive, must be generated on-site, and leaves no residual protection in distribution system, often requiring a small chlorine dose. Ozonation also removes color and odor. Both kill bacteria and viruses.