A principle is a fundamental truth or law that forms the foundation for a system of belief or behavior. It provides guidance and establishes the core rules or concepts in various fields like science ethics and law. Principles are essential for understanding and solving problems in different domains.
Thermal properties of matter study how matter behaves when exposed to heat. It involves concepts like temperature heat capacity thermal expansion and specific heat. The behavior of solids liquids and gases under temperature changes is explained by these properties. Heat transfer occurs by conduction convection and radiation and is governed by thermodynamic principles.
The platinum resistance thermometer works on the principle that the electrical resistance of platinum is a changing function of temperature.
The thermometer is a platinum wire whose resistance varies linearly with temperature. The resistance is measured using a Wheatstone bridge or other precise circuit. By calibrating the resistance at known temperatures, the thermometer can determine an unknown temperature. Platinum is used because of its stability, wide temperature range, and predictable resistance-temperature relationship.
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