States of Matter: Gateway to JEE (Main), NEET, ICAR, OUAT and All Similar Entrance Examinations You need to be friendly with concepts and problems, before appearing any entrance examinations. A systematic flow of concepts and corresponding problems will build your confidence to crack entrance examinations. This gateway will help you rise step wise to reach and crack the entrance examinations. Pratap Sir's Core Concept of States of matter (PSCC: 1): Ideal Gas Equation This equation though applicable to hypothetical ideal gasses, it can be applied to real atmospheric gasses like oxygen, nitrogen, methane etc with little to no error at particular conditions like high temperature and low pressure. This equation contains all gaseous variables like pressure, temperature, volume and number of moles, given by the formula: PV = nRT = (w/m) RT ........ eq. 1 where n = number of moles = given mass (w) / molecular mass (m) . R = Universal gas constant, the value of which depends