In this online lecture Hamad Ahmed Explains first year chemistry chapter number 3 Gases ,The topic being discussed is topic 3.5.2 Application of Dalton's law of partial pressures . Punjab text book board /sindh text book board /KPK text book board inter part 1 chemistry book 1 lecture is conducted in urdu /Hindi /English. This lecture for pre medical /Engineering 11th class for chemistry chapter no 3 is created for all students who want to prepare this topic in detail.