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Temperature is a measure of the hotness or coldness of an object or substance. It quantifies the average kinetic energy of the particles within the system. In simple terms, it tells us how hot or cold something is. Temperature is commonly measured in degrees Celsius (°C) or degrees Fahrenheit (°F) in everyday life, but in scientific and international contexts, it is measured in kelvin (K).
To convert temperature from one unit to another, you can use conversion formulas. Here are the conversion formulas for Celsius, Fahrenheit, and Kelvin:
Celsius (°C) to Fahrenheit (°F): °F = (°C * 9/5) + 32
Fahrenheit (°F) to Celsius (°C): °C = (°F - 32) * 5/9
Celsius (°C) to Kelvin (K): K = °C + 273.15
Kelvin (K) to Celsius (°C): °C = K - 273.15
Remember, when converting temperatures between Celsius and Fahrenheit, you use a linear transformation. For Kelvin conversions, there is a simple addition or subtraction of a constant value.
Let's see a couple of examples:
Example 1: Convert 25 degrees Celsius to Fahrenheit.
°F = (25 * 9/5) + 32 °F = (45) + 32 °F = 77
So, 25 degrees Celsius is equal to 77 degrees Fahrenheit.
Example 2: Convert 300 Kelvin to Celsius.
°C = 300 - 273.15 °C = 26.85 (rounded to two decimal places)
So, 300 Kelvin is approximately equal to 26.85 degrees Celsius.
Keep in mind that Kelvin is the SI unit for temperature, and it is often used in scientific and engineering calculations due to its absolute nature, where 0 K represents absolute zero, the lowest possible temperature where all molecular motion stops.