RP2 Thermal Insulation Flashcards
outline the basic steps of the practical.
- wrap glass beakers with different insulating materials
- boil water in a kettle and pour into the beakers
- record the initial temperature of the water in each beaker
- record how the temperature changes every few minutes
give examples of materials with insulation properties that can be tested using this method.
- newspaper
- corrugated cardboard
- bubble wrap
- polystyrene
- cotton wool
- tin foil
what piece of apparatus is used to measure temperature?
a thermometer.
how can you secure the materials once wrapped around the beaker?
using rubber bands.
as well as wrapping the beaker with the insulation, what else should you do to insulate it?
cut out a circle for the lid of the beaker to reduce heat loss from the top. the lid should have a small hole for the thermometer to fit into.
why do you leave one beaker with no insulation wrapped around it?
to act as a control beaker. it can be used to compare the temperature drop of the water with and without insulation.
how can you compare the effectiveness of the different insulators?
compare the temperature change that has occured over a fixed interval of time. the smaller the temperature change, the more effective the insulator is.
what readings do you take and how frequently?
you record the temperature of the water in fixed intervals of around 3 minutes.
as well as the effectiveness of different types of insulators, what else can you test using this method?
the effectiveness of different thicknesses of the same insulator.
what safety precautions should be taken when carrying out this experiment?
- avoid touching the beaker after heating
- place on a heatproof mat when hot
- take care when pouring boiling water to avoid scolding
- if a beaker cracks, avoid using it and inform a technician
