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rigid

In physics, a rigid body (also known as a rigid object) is a solid body in which deformation is zero or so small it can be neglected. The distance between any two given points on a rigid body remains constant in time regardless of external forces or moments exerted on it. A rigid body is usually considered as a continuous distribution of mass.
In the study of special relativity, a perfectly rigid body does not exist; and objects can only be assumed to be rigid if they are not moving near the speed of light. In quantum mechanics, a rigid body is usually thought of as a collection of point masses. For instance, molecules (consisting of the point masses: electrons and nuclei) are often seen as rigid bodies (see classification of molecules as rigid rotors).

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  1. R

    Gas hob on Flexy !!!

    Some one i know had a boiler fixed over christmas by a gas engineer.And to cut a long story short about wanting a new gas hob and electric oven not going back far enough, the gas man said you are allowed to fit a flexy onto gas hob to get the pipe back to wall far enough for oven to fit...
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    Rigid 300 compact

    Hi all a mate who is retiring is after selling his 110V rigid 300 compact pipe threading machine, Not sure how old it is but I know its not been worked very much, only done about 100 hours since new and is in top condition. These machines go for around 3 grand + Vat new he is looking for...
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    Offered Rigid 100

    Any offers, come and pick up, north london, demonstration of it working if required.
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