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# Chapter 2 Temperature - Thermodynamics, Mechanical Engineering Mechanical Engineering Notes | EduRev

## Mechanical Engineering : Chapter 2 Temperature - Thermodynamics, Mechanical Engineering Mechanical Engineering Notes | EduRev

The document Chapter 2 Temperature - Thermodynamics, Mechanical Engineering Mechanical Engineering Notes | EduRev is a part of the Mechanical Engineering Course Mechanical Engineering SSC JE (Technical).
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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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