8k Flashcards
what are units measuring energy
Joules
In an investigation what is the control variables
A variable that you keep
the same through the whole experiment
In an investigation what is the dependant variable
The variable you measure to see if it changes
In the investigation what is the independent variable
The variable you are changing
What happened when radiation is absorbed by an object
The object gets hotter
Describe light colours in terms of emission and absorption of heat
Light colour are poor emmitters and absorbers of radiation
What two things can happen when radiation hits an object
The radiation is either absorbed or reflected
What is infrared radiation
Waves that transfer thermal energy
What happenes when you mix fluids of diffrent densities
The less dense fluids rises and the more dense fluid sinks
What happened to the density of the liquids and gases when you heat them ?
cool them?
The object becomes less dense upon heating and more dense upon cooling
What is density
how much space an object or substance takes up (its volume)
What is convection currents?
The circulation of liquids and gases
what happend to the movement of particles inside a solid object when you heat it ?
The particles vibrate faster
What is an Insulator and give examples of insulators
A material that’s blocks the flow of thermal energy for example
Wood, wool,feathers,carpets,polystyrene,most clothing
Why are solids better at conduction than liquid and gases
Particles are closer together in solids
