Physical and Chemical Changes
Class 9 Science – Physical and Chemical Changes 🌿 Explanation – Physical and Chemical Changes (भौतिक एवं रासायनिक परिवर्तन) Humne pehle ke chapter mein padha tha ki har पदार्थ (substance) ke kuch physical properties hote hain jaise – colour (रंग), hardness (कठोरता), rigidity (दृढ़ता), fluidity (तरलता), density (घनत्व), melting point (गलनांक) aur boiling point (क्वथनांक)। … Read more