Soaps come in different colours. But why is soap's lather always white in colour?

Can anyone suggest a design,as to how to insert a hallow iron ball, of the size of a football, into a cylinder having full of water while in a vertical...

Hey guys, i just wanted to know about how viable is designing a compressed air two wheeler as part of a final year project? Please give me suggestions regarding how...

Can anybody tell that is necessary to do paper presentation?

Can anybody know y the ceiling fan and table fan r rotating in opposite directions?

Suppose we are charging a gadget requiring 12 volts from a 15 volts rechargeable battery.Then, we say that battery is discharging means its voltage level is decreasing .Then how will...