Understanding the Basics of Temperature Scales

Oct 13, 2025 by windailys.com 67 views

Understanding the Basics of Temperature Scales

Temperature is a fundamental physical quantity that is used to measure the thermal energy of a substance. There are several temperature scales, including Celsius, Fahrenheit, and Kelvin. In this article, we will focus on converting temperatures from Kelvin to Celsius.

What is Kelvin?

The Kelvin scale is an absolute temperature scale that is used in scientific and engineering applications. It is defined such that 0 K is absolute zero, which is the theoretical temperature at which all matter would have zero entropy. The Kelvin scale is used to measure extremely low temperatures, such as those found in cryogenic applications.

Converting Kelvin to Celsius

To convert a temperature from Kelvin to Celsius, we can use the following formula:

°C = K - 273.15

Where K is the temperature in Kelvin and °C is the temperature in Celsius.

Applying the Formula

Let's apply the formula to the given problem. We are asked to find the temperature in degrees Celsius of a substance with a temperature of 49 K.

°C = 49 K - 273.15 °C = -224.15°C

Rounding the Answer

Since the answer choices are given in whole numbers, we can round the answer to the nearest whole number.

°C ≈ -224°C

Conclusion

In conclusion, the temperature of a substance with a temperature of 49 K is approximately -224°C.

Temperature Conversion Chart

Here is a chart that shows the conversion of temperatures from Kelvin to Celsius:

Kelvin	Celsius
0 K	-273.15°C
100 K	-173.15°C
200 K	-73.15°C
300 K	26.85°C
400 K	126.85°C
500 K	226.85°C

Real-World Applications

Temperature conversion is an important concept in many real-world applications, including:

Cryogenics: The study of extremely low temperatures, such as those found in cryogenic applications.
Materials Science: The study of the properties of materials at different temperatures.
Aerospace Engineering: The study of the behavior of materials and fluids at high temperatures.
Medical Applications: The use of temperature control in medical devices, such as thermometers and cryosurgery equipment.

Common Temperature Conversions

Here are some common temperature conversions:

0 K to °C: -273.15°C
100 K to °C: -173.15°C
200 K to °C: -73.15°C
300 K to °C: 26.85°C
400 K to °C: 126.85°C
500 K to °C: 226.85°C

Temperature Conversion Formulas

Here are some common temperature conversion formulas:

Kelvin to Celsius: °C = K - 273.15
Celsius to Kelvin: K = °C + 273.15
Fahrenheit to Celsius: °C = (°F - 32) × 5/9
Celsius to Fahrenheit: °F = (°C × 9/5) + 32

Conclusion

Frequently Asked Questions

Q: What is the temperature in Celsius of a substance with a temperature of 300 K? A: To convert 300 K to °C, we can use the formula: °C = K - 273.15. Therefore, °C = 300 K - 273.15 = 26.85°C.

Q: What is the temperature in Kelvin of a substance with a temperature of 0°C? A: To convert 0°C to K, we can use the formula: K = °C + 273.15. Therefore, K = 0°C + 273.15 = 273.15 K.

Q: What is the temperature in Celsius of a substance with a temperature of 500 K? A: To convert 500 K to °C, we can use the formula: °C = K - 273.15. Therefore, °C = 500 K - 273.15 = 226.85°C.

Q: What is the temperature in Kelvin of a substance with a temperature of 100°C? A: To convert 100°C to K, we can use the formula: K = °C + 273.15. Therefore, K = 100°C + 273.15 = 373.15 K.

Q: How do I convert a temperature from Fahrenheit to Celsius? A: To convert a temperature from Fahrenheit to Celsius, we can use the formula: °C = (°F - 32) × 5/9.

Q: How do I convert a temperature from Celsius to Fahrenheit? A: To convert a temperature from Celsius to Fahrenheit, we can use the formula: °F = (°C × 9/5) + 32.

Q: What is the temperature in Celsius of a substance with a temperature of 400 K? A: To convert 400 K to °C, we can use the formula: °C = K - 273.15. Therefore, °C = 400 K - 273.15 = 126.85°C.

Q: What is the temperature in Kelvin of a substance with a temperature of -20°C? A: To convert -20°C to K, we can use the formula: K = °C + 273.15. Therefore, K = -20°C + 273.15 = 253.15 K.

Q: How do I convert a temperature from Kelvin to Rankine? A: To convert a temperature from Kelvin to Rankine, we can use the formula: °R = K × 9/5.

Q: How do I convert a temperature from Rankine to Kelvin? A: To convert a temperature from Rankine to Kelvin, we can use the formula: K = °R × 5/9.

Q: What is the temperature in Celsius of a substance with a temperature of 200 K? A: To convert 200 K to °C, we can use the formula: °C = K - 273.15. Therefore, °C = 200 K - 273.15 = -73.15°C.

Q: What is the temperature in Kelvin of a substance with a temperature of 50°C? A: To convert 50°C to K, we can use the formula: K = °C + 273.15. Therefore, K = 50°C + 273.15 = 323.15 K.

Conclusion

In conclusion, temperature conversion is an important concept in physics and engineering. By understanding how to convert temperatures from one scale to another, we can better understand the behavior of materials and systems at different temperatures.