Mechanics of gelation distinction between a sol (solution) and a gel therefore appears to be understood in a manner analogous to the practical distinction between the elastic and plastic deformation ranges of a metal. The distinction lies in the ability to respond to an applied shear force via macroscopic viscous flow. In a dynamic sense, the response of a gel to an alternating force (oscillation or vibration) will depend upon the period or frequency of vibration. As indicated here, even most simple liquids will exhibit some elastic response at shear rates or frequencies exceeding 5 x 10 cycles per second. Experiments on such
Control of Vibration at Work Regulations 2005 is the maximum amount that an employee can be exposed to in a day. The values are measured using a formula which works out the average (A) exposure over an 8-hour day. The values are therefore written as A(8). The rate of vibration of a tool or piece of machinery is then measured in metres (m) per second (s) and written as m/s². In order to help employers calculate the exposure levels using the formula, the Health and Safety executive created an exposure calculator. Regulation 5 requires any employer who exposes employees to risk from vibration to make a 'suitable