P2 - Energy transfer by heating 1️⃣✅ Flashcards
What is the textbook definition for specific heat capacity?
Specific heat capacity is the energy required to raise the temperature of 1kg of a substance by 1°C
What does a materials thermal conductivity tell you?
How well it conducts heat
Which materials have a low thermal conductivity?
Thermal insulators
Give three factors that determine the rate of thermal energy transfer through a material
thermal conductivity, temperature difference, thickness of material
What is infrared radiation a type of?
electromagnetic radiation
What is the equation for specific heat capacity?
E = m x c x Δθ
m = mass kg
c = specific heat capacity J/kg°C
Δθ = temperature change °C
What surfaces will be good reflectors of radiation?
Light, shiny surfaces
What surfaces will be good absorbers of radiation?
Dark, matte surfaces
What surfaces will be good emitters of radiation?
Dark, matte surfaces
What surfaces will be bad emitters of radiation?
Light, shiny surfaces
What is conduction?
Conduction is the process where vibrating particles transfer energy to neighbouring particles. The particles in an object being heated vibrate more/faster and collide with each other, these collisions cause energy to be transferred between the particles kinetic energy stores, this is conduction. This process continues throughout the whole object until the energy is transferred to the other side
Convection only occurs in?
Liquids and gasses
What is convection?
Convection is where energetic particles move away from hotter to cooler regions
Name 3 methods of insulating a house.
- loft insulation
- cavity walling
- double glazed windows
The temperature of an object increases if it absorbs ________________?
more radiation than it emits.
