Question

How do i do quantitative observation on a hailstone

Answer 1

I think quantitative observations involve numerical descriptions relating to an object while qualitative observations involve non-numerical descriptions of an object.

In this case the object is a hailstone so quantitative observations would be things such as its volume, mass, weight, temperature, and so on.  Qualitative observations would be things like its color, texture, general shape, and so on.

I hope this helps.  Let me know if anything is unclear.