Answer :
The air bubble in the capillary tube is used for calibration and accurate measurement of the volume of liquid in the tube. It provides a highly precise way to measure volume.
The purpose of the air bubble in a capillary tube is primarily for calibration and measurement purposes. The bubble allows for more accurate measurement of the volume of liquid in the tube. When liquid enters the capillary tube, it pushes the air bubble up the tube. By noting the position of the bubble before and after adding the liquid, one can gain a highly accurate measure of the liquid's volume. It's crucial in science and medicine where precise measurements are needed.
When the liquid column moves up or down the capillary tube, the air bubble acts as a marker, helping to determine the changes in pressure or volume.
For example, in a sphygmomanometer used to measure blood pressure, the air bubble in the capillary tube allows the healthcare provider to read the pressure value accurately.
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