Thermal Insulation REQUIRED PRACTICAL

Question 1

method for thermal insulation REQUIRED PRACTICAL

changing materials

Answer 1

• place a small beaker in a larger beaker
• use a kettle to boil some water
• transfer 80cm cubed of the hot water into the smaller beaker
• use a piece of cardboard for a lid
• make sure the lid has a hole for the thermometer
• place a thermometer through the hole in the cardboard lid (make sure the bulb of the thermometer is in the hot water)
• record the starting temperature of the water
• start a stopwatch (need to record the temperature every 3 minutes for 15 minutes)
• repeat the experiment using the same volume of water but place an insulating material to fill the gap between the 2 beakers (test a range of different insulating materials but use the same mass of materials)
• record all of the results in a table and plot cooling graphs
  INDEPENDENT - TYPE OF MATERIAL
  DEPENDENT - TEMPERATURE
  CONTROLS - VOLUME OF WATER, MASS OF INSULATING MATERIAL, STARTING TEMPERATURE OF THE WATER

Question 2

what does a slowly declining gradient on a cooling graph show

Answer 2

the most effective insulating material

water cools down the most slowly with the most effective

Question 3

method for thermal insulation REQUIRED PRACTICAL

thickness of a material

Answer 3

• beaker with 80cm cubed of hot water
• measure the temperature every 3 minutes for fifteen minutes
• repeat the experiment and wrap 2 layers up to a maximum of 6
  INDEPENDENT - LAYERS OF NEWSPAPER
  DEPENDENT - TEMPERATURE
  CONTROLS - VOLUME OF WATER, STARTING TEMPERATURE OF THE WATER

Question 4

What happens to the rate at which to water cools down at as you increase the layers of newspaper

Answer 4

the more layers of newspaper the slower the water cools down