The aim of this experiment is to find out if a steaming cup of coffee stays warm longer when leaving it untouched, or pouring cold milk into it
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Experiment 16: Coffee and Milk Aim The aim of this experiment is to find out if a steaming cup of coffee stays warm longer when leaving it untouched, or pouring cold milk into it Theory Physics informs us that large quantities of liquid take longer to cool than smaller quantities. Since there are more molecules in a larger quantity of liquid it may take longer to heat, but once the molecules are heated they take longer to cool down than a smaller quantity of water. Therefore I expect the beaker where the milk has been added straight away to have a higher temperature Apparatus * 2 measuring cylinders * Bunsen burner * 2 thermometers * Stirring rods * A larger beaker * Tripod * Coffee powder * Cold milk * Water Procedure 1.
4. Now let a member of your group walk across the laboratory and open the door. Obtain the time duration of this procedure. 5. As soon as the team member returns to the experiment site pour the same amount of cold milk into Beaker B. record the temperatures of both beakers after stirring beaker B for a short time. 6. Now repeat this experiment, but change the amount of time spent going to the door and back. Also change the amount of milk and water used. Record your results appropriately. Data Collection Beaker A Mean Beaker B Mean Amount Of Coffee ? 0.05cm3 150.00 130.00 140.00 150.00 130.00 140.00 Amount Of Milk ?
The only major error that may have occurred is the parallax error. This may have happened during the taking down of readings from the thermometers, although great care was taken to avoid this. Conclusion As the table of results shows; the beaker in which the milk was poured right after the coffee was added (beaker A), meaning it contained more liquid during the procedure of going up to the door and back, did indeed stay warmer. Beaker A was, on average, 1.50?C warmer than Beaker B. This supports my expectations and I conclude the experiment as being successful. Therefore the best option would be to pour the milk before attending to the door, especially if it would take a longer period of time to deal with the person at the door.
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