π₯ 1. Heat and Temperature: Summary
π Key Points:
Heat and Temperature
Heat is a form of energy that flows from a hotter body to a colder one.
Unit: Joule (J)
Instrument: Calorimeter
Temperature is the measure of the hotness or coldness of a body.
Unit: Celsius (Β°C), Fahrenheit (Β°F), Kelvin (K)
Instrument: Thermometer
Heat and temperature are not the same:
Heat depends on mass and energy.
Temperature depends on the average kinetic energy of particles.
π‘οΈ 2. Quantity of Heat: Summary
π Key Points:
Quantity of heat (Q) = Heat energy absorbed or given out
Q=mcΞTQ = mcDelta T
mm: mass (kg)
cc: specific heat capacity (J/kgΒ·Β°C)
ΞTDelta T: change in temperature (Β°C)
Specific heat capacity is the amount of heat required to raise 1 kg of a substance by 1Β°C.
Latent heat: heat energy absorbed or released without change in temperature (during melting, boiling)
π§ 3. Thermal Expansion: Summary
π Key Points:
Thermal expansion is the increase in size, area, or volume of a substance due to heat.
Types:
Linear (length)
Areal (surface area)
Volumetric (entire volume)
Solids expand the least, gases the most.
Applications:
Railway gaps
Bimetallic strips
Overhead power lines
π 4. Transfer of Heat: Summary
π Key Points:
Heat transfers from hot to cold regions in three ways:
Conduction: through solids (molecule-to-molecule)
Convection: through fluids (liquids & gases by movement)
Radiation: through vacuum (no medium needed)
Good conductors: metals like copper, iron
Poor conductors: wood, plastic, air
Convection examples: sea breeze, boiling water
Radiation example: heat from the Sun
For Further Reading:
π Sources of Energy: Chapter Summary for MCQ
π‘ Advanced Hydrostatics MCQs
π― Pressure: MCQ Practice Set
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