Why tomato ketchup starts flowing fromthe bottle when shaken vigorously ?!
Answers: Viscosity level and surface tension. when you shake it you release some of the surface tension allowing it to start moving. The proper way to pour ketchup from a glass bottle is to hold it at a 45 degree angle and slap the bottle on the side with your free had. When using Heinz aim for the 57.
Gravity and pure force