Heat and Pressure- Aviation Physics

Unit -4 (SYLLABUS)
HEAT & PRESSURE
Heat Energy – Thermal Efficiency – Heat
Transfer – Types of Heat Transfer – Thermal
Conductivity - Temperature – Specific Heat –
Thermal Expansion / Contraction – Pressure –
Gauge Pressure – Absolute Pressure –
Different Pressure - Numerical Problems

, Heat Energy
• Heat is a form of energy which is transferred
from a substance having a higher temperature
to a substance having a lower temperature.
• The addition of heat to a substance increases
its internal temperature.
• Heat is defined as the net amount of thermal
energy of a system.

, Heat Energy
• Heat energy is produced due to the motion of
subatomic particles like atoms, ions, and
molecules to solids, gases, and liquids.
• Heat transfer occurs from one system to
another system due to the temperature
difference between the two systems.

, Sources of Heat

• Sun – The living source of energy
Every second of every day the Sun gives us life
generating energy towards Earth, firing our
planet with light and life.
• Earth
The heat energy which is obtained from Earth is
called geothermal energy. It can be found in hot
water and rocks present underground. Heat is
also found in the form of molten rocks and
magma, deep inside the Earth's crust.