HomeEngineering1% concentration of water vapor in air is equivalent to __________ ppm (parts per million). 639. 1% concentration of water vapor in air is equivalent to __________ ppm (parts per million).By Admin / September 6, 2025 A. 10000 B. 1000 C. 100 D. 10 ✅ The correct answer is option A.
1. A fire tube boiler is limited to a maximum steam pressure of about __________ kg/cm². Leave a Comment / Basic Chemical Engineering MCQs, Chemical Engineering, Engineering / By Admin
2. Transformer cores are normally made from Leave a Comment / Basic Chemical Engineering MCQs, Chemical Engineering, Engineering / By Admin