Thermal transfers

Question 1

What is thermal conductivity

Answer 1

Thermal conductivity is how well a material conducts heat (transfers)
Higher tc means that more energy can be transferred by conduction across the material

Question 2

What is conduction

Answer 2

Conduction is mainly in solids. Its the transfer of thermal energy through direct contact between particles
Hot -> Cold
When a part of a solid is heated up, heat energy is transferred to kinetic energy. This causes it to vibrate faster and collide into neighbour particles. This transfers kinetic energy causing other particles to vibrate. This cycle repeats. Technically, the kinetic energy is transferred but overall the thermal energy is.

Question 3

What is convection + convection currents.

Answer 3

Convection is the transfer of thermal energy through the movement of liquids or gase).
When a fluid is heated, it gains kinetic energy. This makes particles move faster and spread out, making that part of the fluid less dense.
The warmer, less dense fluid rises, and the cooler, denser fluid sinks to take its place. This creates a circular flow called a convection current.

Question 4

Density meaning and formula

Answer 4

Density looks at volume (space) and the amount of particles.
Less dense = same volume but less amount of particles.

Density (g/cm3) = mass (g) / volume (cm3)