Thermal Properties of Matter: Class 11 Physics Q&A
11 free answers on Thermal Properties of Matter (Physics) for Class 11 students, across CBSE, ICSE and State boards. Includes questions such as “What is the difference between heat and temperature?”, “Why is 273 called absolute zero?”, “What is 98.6°F in Celsius?”
Question & Answer
Questions
- PhysicsClass 11All
What is the difference between heat and temperature?
Heat and temperature are related concepts in thermodynamics, but they represent different aspects of the thermal state of a substance. Here are five key differences between heat and temperature: Definition: Heat: Heat is a form of energy transfer between two substances at different temperatures. It flows from the substance at a higher temperature to the one at a lower temperature until thermal equilibrium is reached. Temperature: Temperature is a measure of the average
- PhysicsClass 11All
Why is 273 called absolute zero?
There's a common misconception here 273 is not absolute zero. Absolute zero is 0 Kelvin, which equals approximately -273°C (precisely -273.15°C). The number 273 appears in conversions because you add or subtract approximately 273 (precisely 273.15) when converting between Celsius and Kelvin scales.
- PhysicsClass 11All
What is 98.6°F in Celsius?
98.6°F equals 37°C. This is the average normal human body temperature. The conversion formula from Fahrenheit to Celsius is: °C = (°F - 32) × 5/9.
- PhysicsClass 11All
Is 98.6°F 37°C true or false?
True. 98.6°F equals 37°C, representing normal body temperature. More precisely, it's 36.89°C, but 37°C is the standard rounded value used in medical contexts.
- PhysicsClass 11All
What is 273 Kelvin in Celsius?
273 Kelvin equals -0.15°C (or approximately 0°C). More precisely, 273.15 K equals exactly 0°C, which is the freezing point of water. The value 273 K is often used as a rounded approximation.
- PhysicsClass 11All
What is 1 K equal to in Celsius?
1 Kelvin as an absolute temperature equals -272.15°C. This is extremely cold, just one degree above absolute zero. Remember, when converting individual temperatures (not temperature differences), you must subtract 273.15.
- PhysicsClass 11All
How do you convert 293 K to Celsius?
To convert 293 K to Celsius: 293 - 273.15 = 19.85°C (approximately 20°C). This is a comfortable room temperature.
- PhysicsClass 11All
How is 1°C equal to 1 K?
While 1°C is not equal to 1 K as absolute temperatures, a change of 1°C equals a change of 1 K. This is because both scales use identical unit intervals the difference between degrees is the same size. For instance, the difference between 20°C and 21°C is the same magnitude as the difference between 293.15 K and 294.15 K. However, as absolute values, 1°C equals 274.15 K.
- PhysicsClass 11All
How do you convert between K and C?
Converting between Kelvin and Celsius is straightforward: Kelvin to Celsius: Subtract 273.15 (°C = K - 273.15) Celsius to Kelvin: Add 273.15 (K = °C + 273.15) Both scales increase at the same rate, meaning a change of 1°C equals a change of 1 K. The only difference is their starting points.
- PhysicsClass 11All
How do you convert from Kelvin to Celsius?
To convert from Kelvin to Celsius, subtract 273.15 from the Kelvin temperature. The formula is: °C = K - 273.15. For example, if you have 300 K, you would calculate 300 - 273.15 = 26.85°C. This conversion works because the Kelvin and Celsius scales use the same unit size, but they start at different points Kelvin begins at absolute zero while Celsius begins at the freezing point of water.
- PhysicsClass 11All
Does water freeze at 0°F?
No, water freezes at 32°F (0°C) at standard atmospheric pressure. 0°F (-17.8°C) is well below water's freezing point water is solid ice at this temperature. The Fahrenheit scale was originally designed with 0°F as the freezing point of a salt-water mixture, not pure water.