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The least count of an instrument, also known as the smallest possible measurement or reading that can be taken with that instrument, represents its level of precision. It is determined by the scale or markings on the ins trument and is typically expressed in units of measurement.... Read More
Instruments have “least counts,” or the smallest values that the device is capable of measuring or detecting. The scale or resolution of the measuring system of the instrument is what determines its accuracy.
To calculate the least count of an instrument, you need to consider the smallest division or increment on its scale. The least count is found by dividing the value of one division of the main scale by the total number of subdivisions on the auxiliary scale or vernier scale, if applicable.
For instance, a ruler with a least count of 1 millimeter can only be used to measure distances greater than 1 millimeter. For the same reason, a stopwatch with a least count of 0.1 seconds can only measure intervals of time greater than or equal to 0.1 seconds.
Measurement precision is directly proportional to the least count. If the quantity being measured is too small, the instrument will not be able to detect it. Since different measurement tasks call for different degrees of precision, picking a tool with a least count that’s right for you is crucial.
It is important to note that the least count represents the smallest measurement that can be reliably estimated or read from the instrument. However, the actual accuracy or uncertainty of the measurement may depend on various factors, such as the skill of the operator, the condition of the instrument, and the measurement technique used.
Video 01: What is Least count of an instrument?
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