lesson 12 required practical 2: thermal insulators Flashcards
first we do what
place a smaller beaker inside a larger beakers
once placing a smaller beaker inside a larger beaker, then what
we use a kettle to boil some water
once we have used a kettle to boil some water, we do what
transfer 80cm^3 of the hot water into the small beaker
once we have transferred 80cm^3 of hot water into the small beaker, we do what
use a piece of cardboard as a lid for the larger beaker
the lid for the larger beaker must have a hole for what
a thermometer
once we have put a cardboard lid on the larger beaker we do what
place a thermometer through the hole in the cardboard lid
the bulb of the thermometer must be where
in the hot water
once placing a thermometer in our smaller beaker, we do what
record the starting temperature of the water and start a stopwatch
we need to record the temperature of the water when and for how long
every 3 minutes for 15 minutes
once recording our temperature every 3 minutes for 15 minutes, we do what
repeat the experiment using the same volume of hot water
as we repeat the experiment using the same volume of hot water we need use what
an insulating material (eg bubble wrap) to fill in the gap between the two between the two beakers
we should test a range of different insulating materials, such as what
cotton wool
polystyrene balls
if we use different insulating materials, we should do what
use the same mass of insulating material, in each case
in any experiment which variable is the once that changed
independent
in this case the independent variable is what
the type of insulating material
what is the dependant variable
the one that is measured for each change in the independent variable
in this case the dependant variable is the what
the temperature
control variables are what
the ones that we don’t allow to change
the control variables are what
the volume of water and the mass of the insulating material
we need to keep the starting temperature of the water what for each experiment
this can be hard via a
the same
can be hard using a kettle but we have to try
we can record all of our results where
on a table
from these experiments we can plot what for the different insulators
cooling curves
water will cool down slowly with the most what
effective insulating material
we can also investigate how the thickness of a material affects what
the thermal insulation
