Convert the following temperatures to the Kelvin scale: (1) 25 degrees Celsius, 373 degrees Celsius.
The Correct Answer and Explanation is:
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Converted Temperatures to Kelvin:
- 25°C = 298.15 K
- 373°C = 646.15 K
Explanation
Temperature is a fundamental physical quantity that measures the degree of hotness or coldness of a body. It can be measured in different scales: Celsius (°C), Fahrenheit (°F), and Kelvin (K). The Kelvin scale is the SI (International System of Units) unit of temperature and is widely used in science and engineering due to its absolute nature — it starts from absolute zero, the theoretical point where all molecular motion ceases.
The relationship between the Celsius and Kelvin scales is linear. The Kelvin scale is offset from the Celsius scale by exactly 273.15 degrees. The formula to convert Celsius to Kelvin is:Temperature in Kelvin (K)=Temperature in Celsius (°C)+273.15\text{Temperature in Kelvin (K)} = \text{Temperature in Celsius (°C)} + 273.15Temperature in Kelvin (K)=Temperature in Celsius (°C)+273.15
Let’s apply this formula:
- For 25°C:
25+273.15=298.15 K25 + 273.15 = 298.15 \, \text{K}25+273.15=298.15K
- For 373°C:
373+273.15=646.15 K373 + 273.15 = 646.15 \, \text{K}373+273.15=646.15K
These conversions are important in scientific calculations, especially in fields such as thermodynamics, chemistry, and physics. The Kelvin scale eliminates the possibility of negative values (as all values are positive above absolute zero), which simplifies many equations involving gas laws or heat energy.
For instance, in the ideal gas law PV=nRTPV = nRTPV=nRT, temperature must be in Kelvin to ensure accurate results. If we use Celsius, it would distort the proportionality and yield incorrect values since Celsius doesn’t reflect the true kinetic energy of particles.
In conclusion, converting Celsius to Kelvin is a straightforward but essential process for scientific accuracy, particularly when working with laws that describe how particles behave under different temperature conditions. The Kelvin scale provides a true zero point and maintains consistency across all scientific disciplines.
