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Calculated Data : Table of the calculated data for the experimental results above Q=V. I Doctoral That Cold Shoot -(XX-XX) = (XX-XX) VII. Conclusion : The heat transfer (or Heat conduction) is the transfer of thermal energy twine neighboring molecules in a substance due to a temperature gradient. It always takes place from a region of higher temperature to a region of lower temperature, and acts to equalize the temperature differences. Conduction takes place in all forms of matter, solids, liquids and gases. VIII.

Definition of Scientific Notation : Definition : Thermocouples * A Thermocouple is a junction between two different metals that produces a voltage related to a temperature difference. Thermocouples are a widely used type of temperature sensor for measurement and control[l] and can also be used to convert heat into electric power. They are inexpensive[2] and interchangeable and can measure a wide range of temperatures where the main limitation is accuracy. Types of Thermocouples: Different types are best suited for different applications.

They are usually selected based on the temperature range and sensitivity needed. Thermocouples with low sensitivities (B, R, and S types) have correspondingly lower resolutions. Type K (90 percent nickel and 10 percent chromium) is the most common general purpose thermocouple with a sensitivity of approximately 41 pa/C. It is inexpensive, and a wide variety of probes are available in its -200 co to +1350 co anger. This type of thermocouples are made with magnetic materials. Type E (chrome-constant) has a high output (68 pa/C) which makes it well suited to cryogenic use.

Additionally, it is non-magnetic. Type J (iron-constant) has a more restricted range than type K (”40 to +750 co), but higher sensitivity of about 55 pa/C. CO] The Curie point of the iron (770 causes an abrupt change in the characteristic, which determines the upper temperature limit. Type N (Necrosis-Nisei) (Nickel-Chromium-Silicon/Nickel-Silicon) thermocouples are suitable for use at high temperatures, exceeding 1200 co, due to their stability ND ability to resist high temperature oxidation.

Sensitivity is about 39 pa/C at 900 co, slightly lower than type K. Designed to be an improved type K, it is becoming more popular. In addition, there are the Platinum types (B, R and S) platinum-rhodium alloy for each conductor. These are among the most stable thermocouples, but have lower sensitivity than other types, approximately 10 pa/ co. Type B, R, and S thermocouples are usually used only for high temperature measurements due to their high cost and low sensitivity.

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