Question

Which is the instrument is used for determination of degree of stability or instability of an air parcel?

Answer 1

Vertical motion of air is an important factor in the development of weather. Sometimes rising air is made visible by the development of clouds or by the rising dust in dust whirls. Violent vertical motion can be seen in tornados. At other times rising air may occur in the absence of any visual clue. Subsiding air is normally ralatively gentle and associated with clear conditions, except when in association with mountain waves and downburst activity from convective clouds.