Dear Dr Ajith Sir, In The Phoenix workshop 2nd - 7th may, I have proposed to built a falling ball viscometer with the expeyes system.and It sounded interesting and doable to few present there. Back home I have tried to implement the idea. You need graduated cylinder with the experimental liquid and a spherical ball to fall freely through it.Commonly available metal balls have so high density that It cant achieve terminal velocity for the taken length of the cylinder. Plastic balls I used float, so does not serve my purpose.To measure the density of commonly available liquids, I need a small ball of material density slightly grater than 1200Kg/m3. Do any of the group has a suggestion ? What is more interesting is that the same apparatus with slight modifications can be used as a densitometer, once the stated problem is solved . -- *With regards, * *GGB** .................................................... Dr.GOURI GOUTAM BORTHAKUR Assistant Professor & Entrepreneurship educator Writer, Teacher and Research Guide Dept of Physics JORHAT INSTITUTE OF SCIENCE AND TECHNOLOGY Jorhat-10 Assam ** <http://phy-effects.blogspot.com/>* *Ph -9864308097 *