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1. take an AGARBATTI...dont burnt it...go far from it..u will be unable to smell its fragrance and as soon as u burn it u will be able to smell it..thus it can b concluded that gas particles move..

2. take a beaker and take 2 different gases(they r seperated by wall eith pores)...then after sometime v will see that the gases intermix implying that particles of gases move continously...