The seventh and final group of consonants -- श, ष, स, ह -- is the fricative consonants (
Fricative consonants). As an aerospace engineer, fricatives are easy for me to understand. Fricatives are formed by forcing the air from your lungs into a tight channel and causing turbulence in the air flow; it's like placing a model in a wind tunnel.
श
śa, /ɕ,ʃ/
ष
ṣa, /ʂ/