You are provided with a thermometer and a stop clock to record temperature and
time. You also have access to all usual laboratory apparatus.
A liquid loses heat at a rate proportional to its temperature difference above its
Describe the measurements you would make to verify this relationship. Your
description should include:
- a variable you will control to make it a fair investigation
- how you will make your results as accurate as possible
Control variable (1)
e.g. room temperature, no draughts, exclude sunlight
Measure temperature of oil as it cools (1)
Good method
e.g. specified time interval, starting temp at least 70 ºC (1)
Measure room temperature (1)
Sensible precaution (1)
e.g. stir liquid as temperature falls, keep thermometer away
from sides and base, eye level with thermometer reading
