In this video we discass about the basic knowledge about air pressure in Bangla.This is 5th cheter in secondary physics. This chapter is much significant for jsc/ssc /h s c board exam university admission test. Different types of questions comes from this chapter in last few previous chapter. This is my second video on gravitation and gravity chapter. At first we learn about many more on Kepler's law and after completing the chapter then we shall look about m c q from this chapter. HABIGANJ ESCHOOL........ a new you tube channel where you shall get lot of videos on science ( physics, chemistry,math and Ict) and which can help you for bangladesh ssc and HSC board exam.physics students will be very benefited by this bangla tutorial.HABIGANJ ESCHOOL always try to present a easy method to understand in a sort time. we discuss about Newton’s law of Gravitation Law, which is very important in gravitation. Its very helpful for HSC and SSC students. SSC and HSC science students are requested to like and then comment your problem. We will give you solution in comment box. FB LINK: https://web.facebook.com/rajendra.das.54584