298.15 K
Explication
To convert 25°C to Kelvin, you add 273.15 to the Celsius temperature, resulting in 298.15 K. This direct application of the formula ensures accurate scientific measurement.
An increase in temperature of the system
Explication
An increase in temperature of the system causes more vigorous molecular vibration because temperature is directly connected to the vibrational activity of molecules. Higher temperature indicates higher thermal energy, which results in increased molecular vibrations.
The different thermal expansion rates of two bonded metals cause bending.
Explication
The correct answer is that the different thermal expansion rates of two bonded metals cause bending, which is the fundamental principle behind shape change measurement with bimetallic strips. This differential expansion results in a physical deformation that can be used to measure temperature.
The temperature difference between the hot and cold junctions
Explication
The voltage output of a thermocouple is proportional to the temperature difference between its hot and cold junctions, as it is generated by the Seebeck effect based on this difference, not the absolute temperature at a single point.
Resistance decreases as temperature increases
Explication
In typical NTC thermistors, resistance decreases as temperature increases. This property allows them to be used effectively for temperature measurement and regulation, as their resistance change is predictable and correlates with temperature.
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Kelvin scale — starting point?
Begins at absolute zero (0 K).
Temperature conversion — formula?
K = °C + 273.15.
Molecular vibration — role?
Indicates thermal energy and temperature.
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