What is tolerance? Describe in detail unilateral and Bilateral tolerance with neat sketches.

Tolerance in the context of metrology, instrumentation, and tribology refers to the allowable variation or deviation from a specified dimension, physical property, or performance standard. It ensures that parts and components fit and function correctly in systems despite manufacturing or operational variations. Tolerance defines the acceptable limits for errors in dimensions and physical properties, ensuring that products maintain their desired level of quality, efficiency, and performance.

In metrology, tolerance is essential for ensuring precise measurements of physical attributes, such as length, diameter, or thickness, in the manufacturing and engineering processes. In instrumentation, tolerance ensures that measuring devices, sensors, and other equipment can operate accurately within predefined limits. In tribology, tolerance relates to the surfaces in contact with each other, ensuring proper interaction without excessive wear or friction.

### Unilateral Tolerance
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