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# Research question: Does the temperature of water affect its rate of evaporation? Assuming that water is kept in the same container.

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Introduction

Lab Report: Rate of Evaporation

Research question:

Does the temperature of water affect its rate of evaporation? Assuming that water is kept in the same container.

Introduction:

Water is one of the most important element for life to exist. We need water everyday in order to survive. Water is also known as H2O in its chemistry form, there are three phases in which water can stay: solid, liquid and gaseous state. It is common knowledge that below 0˚C, water will freeze, at 100˚C it will boil, and from 0 to 100˚C, it will remain its liquid state. Although when liquid water is kept at constant temperature it seems like it is not changing, the water is actually evaporating slowly. If a glass of water was left out for long enough, after some time the water will have completely evaporated.

Middle

The shape of the container; The material of the container The surface area or the water.

Uncontrollable variables:

• When water stays at a stable temperature.
• Airflow in the room
• Room temperature is not completely kept constant.

There will be errors because we measure the water temperature after heated by the heater. Measurements might be taken too early while the water is still being heated and temperature is still rising. That way the results will not be accurate. In order to reduce that error, temperature of the water will be only taken when the reading on the thermometer to 1 decimal place does not change in 5 minutes.

Airflow in the room cannot be completely controlled, we try to reduce this error by setting the experiment away from doors and windows and by turning off the air conditioner during the process of the experiment.

Conclusion

Then the heater will be turned on and put at 20˚C, the second measurements will be taken once the water temperature becomes stable. Again, the temperature of water and the time taken for 20ml of water to evaporate will be recorded. After that, the heater will be turned 5˚C higher, at 25˚C. And the same procedure will be repeated at 30˚C, 35˚C, 40˚C, 45˚C, 50˚C, 55˚C, 60˚C (10 different temperature measurements altogether). This experiment will be repeated 3 times.

In this experiment there are some risks of getting burned by the heater towards the last measurements if the experiment is not done carefully. There are no other risks or dangers of procedure.

The range independent variable (temperature change) is according to the heater. The heater’s temperature will be raised by 5˚C for each measurements. As the procedure is repeated 10 times, the range temperature or the heater will change by 50˚C.

This student written piece of work is one of many that can be found in our International Baccalaureate Physics section.

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