Can someone explain? (Celcius to Kelvin question)

In summary, the formula for converting Celcius to Kelvin is K = C + 273.15, where K is the temperature in Kelvin and C is the temperature in Celcius. Kelvin is used in scientific calculations because it is an absolute temperature scale that starts at absolute zero (0 K), making it easier to perform calculations and compare temperatures. To convert negative Celcius temperatures to Kelvin, simply add 273.15 to the negative Celcius temperature. There is a shortcut for converting Celcius to Kelvin by adding 273 and moving the decimal point three places to the left. The number 273.15 represents absolute zero on the Kelvin scale and is necessary for accurate conversions between the two temperature scales.
  • #1
Edin_Dzeko
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A sample of liquid is heated from room temperature to just below the boiling point. The overall change in temperature is 75°C. Express this temperature change in kelvins.

The book has the answer as 75K. How did they arrive at that answer? I don't think I understand the problem. I rather converted from 75C to K and got 348 instead. Help please?
 
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  • #2
The change in temperature is 75 C, but the actual temperature is unknown. Since kelvin degrees and celsius degrees are the same magnitude, a change in temp. of 75 C is the same as a change of 75 K.
 

Question 1: What is the formula for converting Celcius to Kelvin?

The formula for converting Celcius to Kelvin is K = C + 273.15, where K is the temperature in Kelvin and C is the temperature in Celcius.

Question 2: Why do we use Kelvin instead of Celcius in scientific calculations?

Kelvin is used in scientific calculations because it is an absolute temperature scale that starts at absolute zero (0 K), which is the lowest possible temperature. This makes it easier to perform calculations and compare temperatures in different systems.

Question 3: How do I convert negative Celcius temperatures to Kelvin?

To convert negative Celcius temperatures to Kelvin, simply add 273.15 to the negative Celcius temperature. For example, -20 degrees Celcius is equivalent to 253.15 Kelvin (-20 + 273.15 = 253.15).

Question 4: Is there a shortcut or trick for converting Celcius to Kelvin?

Yes, there is a shortcut or trick for converting Celcius to Kelvin. Simply add 273 to the Celcius temperature and then move the decimal point three places to the left. For example, 25 degrees Celcius is equivalent to 298 Kelvin (25 + 273 = 298, move the decimal point three places to the left = 298).

Question 5: Can someone explain the significance of the number 273.15 in the Celcius to Kelvin conversion formula?

The number 273.15 is the value of absolute zero on the Kelvin scale. This means that 0 Kelvin is equal to -273.15 degrees Celcius, and any temperature above absolute zero will have a positive value in Kelvin. This conversion factor is necessary to accurately convert between the two temperature scales.

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