Chapter 2 Temperature - Thermodynamics, Mechanical Engineering Mechanical Engineering Notes | EduRev
Mechanical Engineering SSC JE (Technical)
Mechanical Engineering : Chapter 2 Temperature - Thermodynamics, Mechanical Engineering Mechanical Engineering Notes | EduRev
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Chapter 2
TEMPERATURE
Zeroth law of Thermodyamics
• The zeroth law of thermodynamics states that if two thermodynamic systems are each in thermal equilibrium with a third one, then they are in thermal equilibrium with each other.
• Zeroth law of thermodynamics is the basis of temperature measurement
| Thermometer | Thermometric property |
| Constant vol. gas thermometer | Pressure (P) |
| Consant pressure gas thermometer | Volume (V) |
| Resistance thermometer (Thermistor) | Resistance (R) |
| Thermo couple | EMF (e) |
| Mercury in glass thermometer | Length (L) |
| Thermometer | Temp. range |
| Platinum resistance Thermometers | –200ºC – 1200ºC |
| Thermoelectric thermometers | –200ºC – 1600ºC |
| Radiation pyrometers | above 400ºC |
| Segar cone | 600ºC – 2000ºC |
| Optical pyrometers | above 650ºC |
| Gas Thermomenters | –200ºC – 1200ºC |
- Thermocouple uses copper–constantan, platinum, rhodium, thodium, chromel alumel combinations.
Temperature
The temperature is a measure(degree) of hotness or coldness.(freezing cold, warm hot)
Temperature scales
- They are related to absolute temperature scales.
- The temperature scales used in the SI and English system are the celsius scale and the Fahrenheit scale, respectively.
- A scale of temperature independent of the thermometric substance is called a thermodynamic temperature scale.
- Kelvin scale is related to celsius scale by
T(K) = T(C) + 273.16
- Rankine scale is related to Fahrenheit scale by
T(K) = T(C) = 459.67
- The temperature scales in the two unit systems are related by
T(R) = 1.8T(K)
T(0F) = 1.8T(0C) + 32
ΔT(0F) = 1.8ΔT(K) = ΔT(R)
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Up next
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