Immersion Effect of Thermometer

In this article post I am going to share about immersion effect of thermometer, a liquid in glass thermometer is one of the most common types of temperature measurement devices. It consists of a large glass bulb at the lower and capillary tube with the scale and Liquid Filling bulb and portion of capillary. In addition at the smaller bulb is generally incorporated exceeded, a widely the bulb holes the major portion of liquid. As temperature is raised grater expansion of liquid compared indicated by etched meanings.

Greatest sensitivity to temperature is at one bulb where largest volume of liquid is contained flow over all portion of a glass. thermometer are sensitive to temperature with temperature variation. the stem and only liquid space and wave maximum accuracy is obtained. it is necessary to specify how to a glass thermometer is to be specified to temperature.

Greatest control is obtained when complete thermometer is entirely immersed in a uniform temperature medium but practically this is not possible when are medium is liquid. A common procturm immersed with proper depth of immersion with proper prescribed for this condition only this technique does not ensure absolute uniformly because upper position of stem is still subjected to some variations in ambient condition.

The liquid in glass thermometer are commonly manufactured into two types

1. Total immersion

2. Partial immersion

The total immersion type thermometer are calibrated to read correctly when immersed to identify length and width expressed portion is of a temperature difference from that at calibration, the correction have to be applied to reading. In order to apply a correction have to be applied to reading in order to apply a correction a small auxiliary thermometer is attached in proximity of stem of thermometer to be corrected. This is done to measure across the temperature of emergent stem, current immersion but with surrounding air temperature different from that of its original calibration condition the correction to be applied can be calculated as

correct temperature = measured temperature + correction.

Source by Sivaswamy Hariprasad

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