Difference between Mixture and Solution
http://www.princeton.edu/~pccm/outreach/scsp/mixturesandsolutions/background.htm
Notes for Physical Science
https://www.itschool.gov.in/pdf/std_IX/eng_medium/Physical_Science/Part_I/Unit_01.pdf
https://www.itschool.gov.in/pdf/std_IX/eng_medium/Physical_Science/Part_I/Unit_02.pdf
https://www.itschool.gov.in/pdf/std_IX/eng_medium/Physical_Science/Part_I/Unit_03.pdf
