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<h2 class="wp-block-heading" id="h-introduction">Introduction</h2>
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<p>Welcome to this physics lesson on <strong>thermal physics</strong>. In today’s class, we’ll dive into the topic of <strong>heat and thermodynamics</strong>, which cuts across several important subtopics such as <strong>temperature, measurement, and expansion</strong>. These concepts are essential for students preparing for <strong>WAEC, NECO, JAMB, and IGCSE Physics exams</strong>.</p>
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<p>Let’s get started with the questions and answers.</p>
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<h2 class="wp-block-heading" id="h-what-is-heat">What is Heat?</h2>
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<p><strong>Heat</strong> is a form of energy that causes the sensation of warmth. It flows from a body of higher temperature to one of lower temperature. Heat plays a vital role in everyday life and in scientific applications, from <strong>engines</strong> to <strong>refrigeration systems</strong>.</p>
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<h2 class="wp-block-heading" id="h-temperature-and-its-measurement">Temperature and Its Measurement</h2>
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<h3 class="wp-block-heading" id="h-definition-of-temperature">Definition of Temperature</h3>
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<p><strong>Temperature</strong> is the degree of <strong>hotness or coldness</strong> of a body. It is a measure of the <strong>average kinetic energy</strong> of the particles in that body. The faster the particles move, the higher the temperature.</p>
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<h3 class="wp-block-heading" id="h-instruments-for-measuring-temperature">Instruments for Measuring Temperature</h3>
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<p>Temperature is measured using a device called a <strong>thermometer</strong>. There are different types of thermometers used for various purposes:</p>
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<li><strong>Clinical Thermometer</strong> – used to measure human body temperature. It features a constriction to prevent mercury from falling back after removal.</li>
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<li><strong>Laboratory Thermometer</strong> – used for scientific experiments; it lacks the constriction found in clinical thermometers.</li>
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<h3 class="wp-block-heading" id="h-units-of-temperature">Units of Temperature</h3>
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<p>The <strong>SI unit of temperature</strong> is the <strong>Kelvin (K)</strong>. It is preferred in scientific measurements because it starts from <strong>absolute zero (0 K = -273°C)</strong>, where molecular motion theoretically stops.</p>
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<p>Other temperature scales include:</p>
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<li><strong>Celsius (°C) scale</strong></li>
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<li><strong>Fahrenheit (°F) scale</strong></li>
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<li><strong>Rankine scale</strong></li>
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<h3 class="wp-block-heading" id="h-conversion-between-scales">Conversion Between Scales</h3>
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<p>Different temperature scales have unique conversion formulas. For example:</p>
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<li>From Celsius to Kelvin:</li>
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<li>K=°C+273</li>
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<li>So, water freezes at <strong>0°C (273 K)</strong> and boils at <strong>100°C (373 K)</strong> on the Kelvin scale.</li>
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<p><mark style="background-color:rgba(0, 0, 0, 0)" class="has-inline-color has-vivid-cyan-blue-color"><strong>Watch more educational videos and past questions:</strong> </mark><a href="https://youtube.com/@allcbts">https://youtube.com/@allcbts</a></p>
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<h2 class="wp-block-heading" id="h-conclusion">Conclusion</h2>
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<p><strong>Heat and temperature</strong> are foundational concepts in thermal physics. Understanding their measurement, units, and conversions is crucial for solving exam questions and real-world physics problems. By mastering this topic, students can confidently tackle <strong>thermal physics sections</strong> in major external examinations.</p>
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