Thermodynamik & Wärmeübertragung · GCSE Physics Topic 3 (Thermal Properties)
Spezifische Wärmekapazität & Kalorimeter
Spezifische Wärmekapazität & Kalorimetrie: Q = c·m·Δt und Land-See-Windsystem
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Experimentelle Steuerungsparameter
J
kg
Echtzeit-Herleitung & Kennzahlen
Temperaturanstieg A
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Temperaturanstieg B
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Verhältnis der Temperaturanstiege
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Windrichtung
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Echtzeit-Formelherleitung
Grundformel:
--Einsetzungsschritte:
--Physikalischer Zustand: --
Typische Beispielaufgaben & Prüfungsfallen
Worked Problem
Aufgabe: 2kg of water heats from 20°C to 70°C. Find absorbed heat. If 2kg of unknown liquid absorbs same heat rising 100°C, find its specific heat.
Schrittweise Herleitung:
- Q = 4200 * 2 * 50 = 420 kJ. For liquid: c = Q / (m*Δt) = 420,000 / (2*100) = 2100 J/(kg°C) (kerosene).
Worked Problem
Aufgabe: In comparing specific heat capacities, why must identical heaters be used?
Schrittweise Herleitung:
- Conversion method! Identical heaters output heat at an equal rate, so heating time directly gauges absorbed heat energy.
Arbeitsblatt für den Unterricht & Hausaufgaben
Q1. Variant 1: Why do residential heating radiators and car cooling systems universally choose water as the medium?
Answer Key: Water has huge heat capacity! Releasing heat cools it slowly, delivering immense warmth; absorbing waste heat raises its temp modestly.
Q2. Variant 2: In comparing water vs cooking oil, a student heated "equal volumes". Is this valid?
Answer Key: Invalid! Specific heat requires equal mass. Different densities make equal volume yield unequal masses, violating controlled variables.
Q3. Variant 3: An 800°C iron block drops into cold water. Does heat gained strictly equal heat lost?
Answer Key: In reality, heat gained < heat lost. Heat leaks into ambient air and the bowl container unless isolated in an ideal calorimeter.
Häufige Fragen & typische Missverständnisse
What physics explains the extreme desert diurnal temperature swing in Xinjiang?
Sand has very low heat capacity (~1/5 of water). Intense daytime sun shoots temperatures up; rapid nocturnal radiation drops temperature toward freezing.
Why do farmers flood rice paddy seedlings before cold nights and drain them in the morning?
Water's high heat capacity buffers night frost: slow cooling keeps soil warm at night. Draining water in daytime lets thin soil heat fast.
Does absorbing heat always raise temperature? Does losing heat always lower it?
Not during phase changes! Melting ice and boiling water absorb heat at constant temperature (latent heat); freezing releases heat at constant temperature.
How to avoid confusing heat, temperature, and internal energy in physics exams?
Heat is a transfer process (absorbed/released, never "contained"). Temperature is a state. Internal energy is microscopic energy possessed by all matter.