physics
define mass
Mass is the amount of matter in an object
unit for mass
kg
symbol for mass
M
define volume
Volume is the amount of space an object occcupies
unit for volume
m3
symbol for volume
V
define density
Density is the mass per unit volume of a substance
unit for density
m3
symbol for density
P
density equation
p = mass divided by volume
what density would a substance have if it were to sink
If a substance has density greater than 1cm3, it will sink
good conductors
copper , alumunium , silver
good insulators
rubber , plastic , glass
what are the of a good insulator
High resitivity, Durability, Cost-effectiveness, Low thermal conductivitiy
What is convection
the process of transferring heat through air or liquid currents
How to prevent heat loss due to convection
By sealing the item to trap air
What is conduction
The transfer of energy, through a substance.
How to prevent heat loss due to conduction
By using a good insulator that traps gases
what is radiation
energy that moves from one place to another in waves or particles
How to prevent heat loss due to radiation
Reflect the waves back in
what is a fiber cell
long cells with lignified secondary cell walls
why are radiators matte
A more shiny, reflective surface is less likely to conduct heat