A road was being laid in front of our house and a man began pulling a heavy vibrating roller over the concrete that had been spread over the road.
Why are such vibrating rollers used in road building?
Whenever you pour rice into a tall container, you shake the container vigorously from time to time so that the grains settle down making room for more.
Similarly, when concrete is laid on roads, the road has to be shaken to enable the concrete to seep down into all the nooks and crannies and fill up all the crevices, leaving no air pockets.
The vibrating roller used by road-builders makes a lot of noise but all that it is doing is shaking up the road!
Picture Credit : Google