Calorimetry and Thermal Expansion Revision Notes - IIT JEE/NEET Preparation | Nucleon

Calorimetry and Thermal Expansion

  • HEAT
  • The energy that is being transferred between two bodies or between adjacent parts of a body
    as a result of temperature difference is called heat. Thus, heat is a form of energy. It is energy
    in transit whenever temperature differences exist. Once it is transferred, it becomes the internal
    energy of the receiving body. It should be clearly understood that the word "heat" is meaningful
    only as long as the energy is being transferred. Thus, expressions like "heat in a body" or
    "heat of a body" are meaningless

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  • Mechanical Equivalent of Heat
  • In early days heat was not recognized as a form of energy. Heat was supposed
    to be something needed to raise the temperature of a body or to change its
    phase. Calorie was defined as the unit of heat. A number of experiments were
    performed to show that the temperature may also be increased by doing
    mechanical work on the system.

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  • SPECIFIC HEAT
  • Specific heat of substance is equal to heat gain or released by that substance to raise or fall
    its temperature by 1ºC for a unit mass of substance.

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  • Heat capacity or Thermal capacity
  • Heat capacity of a body is defined as the amount of heat required to raise the temperature
    of that body by 1°. If 'm' is the mass and 's' the specific heat of the body, then
    Heat capacity = m s.

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  • Relation between Specific heat and Water equivalent
  • It is the amount of water which requires the same amount of heat for the same temperature rise as
    that of the object

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  • CALORIMETRY
  • The branch of thermodynamics which deals with the measurement of heat is
    called calorimetry

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  • Zeroth law of thermodynamics
  • Zeroth law of thermodynamics

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  • THERMAL EXPANSION
  • Most materials expand when their temperature is increased. Rails roads
    tracks, bridges all have some means of compensating for thermal expansion.
    When a homogeneous object expands, the distance between any two points
    on the object increases. Figure shows a block of metal with a hole in it

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  • LINEAR EXPANSION
  • LINEAR EXPANSION
    When the rod is heated, its increase in length ?L is proportional to its original

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  • Thermal stress of a material
  • If the rod is free to expand then there will be no stress and strain. Stress and strain is
    produced only when an object is restricted to expand or contract according to change in
    temperature. When the temperature of the rod is decreased or increased under constrained
    condition , compressive or tensile stresses are developed in the rod. These stresses are
    known as thermal stresses.

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  • Variation of time period of pendulum clocks
  • The time represented by the clock hands of a pendulum clock depends on the number
    of oscillation performed by pendulum every time it reaches to its extreme position the
    second hand of the clock advances by one second that means second hand moves by
    two seconds when one oscillation in complete

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  • Measurement of length by metallic scale
  • Measurement of length by metallic scale

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  • SUPERFICIAL OR AREAL EXPANSION
  • When a solid is heated and its area increases, then the thermal
    expansion is called superficial or areal expansion. Consider a solid plate

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  • VOLUME OR CUBICAL EXPANSION
  • When a solid is heated and its volume increases, then the expansion is
    called volume expansion or cubical expansion. Let us consider a solid or
    liquid whose original volume

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  • RELATION BETWEEN
  • RELATION BETWEEN

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  • VARIATION OF DENSITY WITH TEMPERATURE
  • VARIATION OF DENSITY WITH TEMPERATURE
    As we known that mass = volume × density .
    Mass of substance does not change with change in temperature so with increase of
    temperature, volume increases so density decreases and vice-versa.

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  • APPARENT EXPANSION OF A LIQUID IN A CONTAINER
  • APPARENT EXPANSION OF A LIQUID IN A CONTAINER

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  • VARIATION OF FORCE OF BUOYANCY WITH TEMPERATURE
  • VARIATION OF FORCE OF BUOYANCY WITH TEMPERATURE

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  • BIMETALLIC STRIP
  • It two strip of different metals are welded together to form a bimetallic strip, when heated uniformly it bends in
    form of an arc, the metal with greater coefficient of linear expansion lies on convex side. The radius of arc thus
    formed by bimetal is

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  • TEMPERATURE
  • Temperature may be defined as the degree of hotness or coldness of a body. Heat energy
    flows from a body at higher temperature to that at lower temperature until their temperatures
    become equal. At this stage, the bodies are said to be in thermal equilibrium.

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  • Thermometers
  • Thermometers are device that are used to measure temperatures. All thermometers are based on the
    principle that some physical property of a system changes as the system temperature changes.
    Required properties of good thermometric substance.

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