A jackhammer (pneumatic drill or demolition hammer in British English) is a pneumatic or electro-mechanical tool that combines a hammer directly with a chisel.
 
The effectiveness of the jackhammer is dependent on how much force is applied to the tool. MEDIUM TO LARGE ELECTRIC BREAKERS ARE USED IN THE SAME MANNER AS THE PNEUMATIC AIR BREAKERS ONLY IN A MORE COST EFFECTIVE MANNER, it is generally used to like a hammer to break the hard surface or rock in construction works