Evaporation Experiment Worksheet for 4th - 6th Grade | Lesson Planet - Free Printable

Problem Description:

The task involves conducting an evaporation experiment using a plastic container filled with water. The goal is to observe and record the changes in the water level over time, analyze the data, and draw conclusions about evaporation.

Solution and Explanation:

#### Step-by-Step Guide to Solving the Problem:

1. Prepare the Container:
- Fill a clear plastic container (transparent) with water up to the 2-liter mark.
- Mark the initial water level clearly on the side of the container using a permanent marker.

2. Record Initial Observations:
- On the first day of your journal (Day One), write down the date and time.
- Take a picture of the container showing the marked water level.
- Record the height of the water level in your journal. For example, if the water reaches the 2-liter mark, note this measurement.

3. Decide on Observation Frequency:
- Decide how often you will observe and measure the water level. Common intervals are daily or every few days.
- For this example, let’s assume you decide to observe the water level every three days.

4. Continue Observing and Recording:
- On each observation day, repeat the following steps:
- Measure the current water level and compare it to the previous measurements.
- Record the new water level in your journal.
- Take a picture of the container to document the change visually.
- Note any observations about the environment (e.g., temperature, humidity, sunlight exposure).

5. Last Day of Observations:
- On the last day of your observation period, record all final observations and measurements.
- Compare the final water level to the initial level and calculate the total amount of water lost due to evaporation.

6. Analyze the Data:
- Use the data from your journal to create a graph. Plot the date/time on the x-axis and the water level on the y-axis.
- Analyze the trend in the graph. Does the water level decrease steadily? Are there any patterns or anomalies?

7. Write a Conclusion:
- Summarize your findings based on the data and graph.
- Explain what happened to the water during the experiment. For example:
- Water evaporated over time, causing the water level to drop.
- The rate of evaporation might have been influenced by factors such as temperature, humidity, or air movement.
- Discuss any real-world applications or scientific principles related to evaporation (e.g., the water cycle, cooling effects, etc.).

8. Support Your Conclusion:
- Refer to scientific research or theories that explain evaporation. For example:
- Evaporation occurs when water molecules gain enough energy to escape from the liquid state into the gaseous state.
- Factors like temperature, surface area, and wind speed affect the rate of evaporation.
- Cite sources if necessary to support your explanation.

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Example Journal Entries:

#### Day One:
- Date/Time: [Insert Date and Time]
- Water Level: 2 liters
- Observations: Water level marked at 2 liters. No visible changes yet.
- Picture: Attached (showing the full water level).

#### Day Four:
- Date/Time: [Insert Date and Time]
- Water Level: 1.8 liters
- Observations: Water level has dropped by 0.2 liters. Surface appears slightly drier.
- Picture: Attached (showing the reduced water level).

#### Day Seven:
- Date/Time: [Insert Date and Time]
- Water Level: 1.6 liters
- Observations: Water level continues to drop. More noticeable reduction.
- Picture: Attached.

#### Last Day (Day Ten):
- Date/Time: [Insert Date and Time]
- Water Level: 1.4 liters
- Observations: Total water loss is 0.6 liters over 10 days. Surface is visibly dry.
- Picture: Attached.

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Graph:

- Create a line graph with:
- X-axis: Time (Days)
- Y-axis: Water Level (Liters)
- Plot the points for each observation day and connect them to show the trend.

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Conclusion:

- Summary of Findings: Over the course of the experiment, the water level decreased from 2 liters to 1.4 liters, indicating a total loss of 0.6 liters due to evaporation.
- Explanation: Evaporation occurred as water molecules gained enough energy to transition from the liquid state to the gaseous state. Factors such as room temperature and air circulation likely influenced the rate of evaporation.
- Scientific Support: This process aligns with the principles of evaporation, where water molecules escape into the atmosphere, leaving behind a lower water level in the container.

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Final Answer:

$$
\boxed{\text{The water level decreased over time due to evaporation, as documented through regular measurements and supported by scientific principles of evaporation.}}
$$