Quick Answer: What is the least count of screw gauge why is it called least count?

What is meant by least count of a screw gauge?

Least count: The least count of the screw is defined as the distance moved by the tip of the screw when turned through one division of the head scale. Least count (LC) of the screw gauge = (pitch)/(total no.of divisions on the circular scale)

What is called as least count?

The smallest value that can be measured by the measuring instrument is called its least count. Measured values are good only up to this value. … A Vernier scale on a caliper may have a least count of 0.1 mm while a micrometer may have a least count of 0.01 mm.

What is least count explain with example?

Definition: The smallest value up to which an instrument can measure is called least count of the instrument. Example: least count of meter rule is up to 1 mm. least count of Vernier caliper is 0.01 cm.

What is least count how least count for vernier caliper and screw gauge are defined?

Screw gauge is a more accurate measuring instrument than the vernier caliper. The least count of screw gauge is equal to the ratio of pitch of the screw to the number of the division on circular scale. For example: Pitch of the screw =1 mm. Number of circular scale division =100. ∴ Least count of screw gauge =1001mm​=0 …

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What is the least count of screw gauge in centimeters?

The minimum length that can be measured using a screw gauge is known as the least count of that screw gauge. Similarly, some screw gauges have a 1mm pitch with 100 divisions on the circular scale. ∴ least count = 1 / 100 = 0.01mm Hence, the least count of micrometer screw gauge is 0.01mm or 0.0001cm.

What is the least count of micrometer screw gauge?

Least count of the micrometer screw gauge = Pitch of screw / No. of circular scale division = 0.1 mm / 100 = 0.001 mm. Hence the least count of the micrometer screw gauge is 0,001 mm.

How do you determine the least count of screw gauge?

The formula of least count of screw gauge is as follows:

  1. Least count of screw gauge = (Pitch)/(number of divisions)
  2. Least count of micrometer screw gauge = (1 mm)/(100) = 0.01 mm.

How is least count measured?

Mathematically a measurement instrument Least Count is calculated by dividing main scale reading by the total number of divisions on the main scale. And if the instrument also has a Secondary scale. Then instrument LC is the ratio of main scale L.C. and number of divisions on the secondary scale.

What is least count of weighing balance?

Some manufacturers direct in their operating manual to weigh minimum 1.0 mg on balance having 0.01 mg least count i.e. least count X 100. But the thumb rule followed in pharmaceutical industries for lower limit is least count X 50 and the upper limit is 80% of the capacity of the balance.

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What is the least count of any instrument?

The least count of an instrument is the smallest measurement that can be taken accurately with it. The least count of meter scale is 1mm, and that of the ammeter shown below is 2 ampere.

What is least count of scale?

Least count of a measuring instrument is the smallest measurement that can be made accurately with the given measuring instrument. A metre scale normally has graduations at 1 mm (or 0.1 cm) spacing, as the smallest division on its scale.