Describe the adiabatic expansion and thermal resistance, Physics

a) Explain what is meant by the term "Heat Energy"

b) An Aluminium bar 0.5m long, initially at 20°C is heated until its temperature rises by 50 ⁰C. Determine the change in length of the bar that will occur.

c) Describe what is meant by the term "Adiabatic expansion"

d) Describe what is meant by the term "Thermal Resistance"

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