1. It is the angle between two plane refracting surfaces of the prism.

    It is the angle between two plane refracting surfaces of the prism.

    See less
    • 9
  2. In industrial fixation, the nitrogen gas combines with hydrogen under pressure and high temperature to yield ammonia.

    In industrial fixation, the nitrogen gas combines with hydrogen under pressure and high temperature to yield ammonia.

    See less
    • 9
  3. The process of conversion of ammonia into nitrites is called nitrification.

    The process of conversion of ammonia into nitrites is called nitrification.

    See less
    • 8