How do you measure work done?

How do you measure density of a gas?

How do you measure density of a liquid using a graduated measuring cylinder?

How do you measure density of an irregula solid by using Eureka can?

How do you measure density of a liquid using a density bottle?

How do you measure the time period of a given pendulum? Why do you note the time for more than one oscillation?

How will you calculate work done on an ideal gas in a compression, when change in pressure is carried out in infinite steps ?

What do you understand by work done ? Write its SI unit. Obtain the relation between Joule and erg

How do you account for the following: Tail of comets

How do you account for the miscibility of ethoxyethane with water?

How do you charge an object by conduction?