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# 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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Introduction

## 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. First of all the coffee has to be made.

Middle

Mean

Amount Of Coffee ± 0.05cm3

150.00

130.00

140.00

150.00

130.00

140.00

Amount Of Milk ± 0.05cm3

15.00

25.00

20.00

15.00

25.00

20.00

Temp. Of Coffee ± 0.05°C

100.00

100.00

100.00

100.00

100.00

100.00

Conclusion

## 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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