The Best Examples of 3 Practical Examples of Science Experiments (Plus More to Try)

When you teach process essays, you’re really teaching students how to explain how to do something step by step. Science experiments are some of the best examples of this kind of writing, because they already come with:

• A clear purpose (What are we trying to find out?)
• Materials (What do we need?)
• Procedure (What steps do we follow?)
• Results and reflection (What happened and why?)

So instead of starting with a dry topic like “How to clean your room,” you can give students examples of 3 practical examples of science experiments that feel like real science and real writing at the same time.

Below are three anchor experiments you can use as the core of a process-essay unit, plus several extra variations. Each one is designed to be:

• Affordable and easy to set up
• Safe for home or school
• Rich in cause‑and‑effect thinking
• Flexible for grades 4–10 (with small tweaks)

Example 1: Testing Handwashing and Germs (Simple Microbiology in Action)

If you’re looking for an example of a science experiment that connects directly to students’ lives, this is it. Since 2020, students have heard nonstop about handwashing, germs, and viruses. Turning that into a process essay topic makes the writing feel meaningful, not random.

This experiment explores how well different handwashing methods clean our hands. It can be done with safe “germ” substitutes like glitter or cooking oil and pepper.

How the Experiment Works (In Plain Language)

Students compare at least three conditions, for example:

• No washing
• Rinsing with water only
• Washing with soap and water for 20 seconds

You can use glitter, cocoa powder, or a mix of oil and ground pepper to stand in for germs. Students follow a clear procedure:

1. Coat their hands with the “germs.”
2. Try different washing methods.
3. Observe how much “germ” material remains.

In a process essay, students describe each step, then explain the outcome: which method removed the most “germs,” and why.

Why This Is One of the Best Examples of Practical Experiments

This is one of the best examples of a practical experiment because it:

• Connects directly to public health guidance from sources like the Centers for Disease Control and Prevention (CDC), which recommends washing with soap and water for at least 20 seconds (CDC handwashing guidance).
• Produces visible results students can easily describe in their essays.
• Encourages students to use transition words (first, next, then, finally) in a natural way.

For a stronger process essay, have students:

• Write a materials list in bullet or paragraph form.
• Number or clearly separate their steps.
• Add a short explanation of the science: soap molecules attach to oils and help lift them (and germs) off the skin.

You can expand this into more examples of conditions:

• Hand sanitizer vs. soap and water
• Cold water vs. warm water
• A 5‑second wash vs. a 20‑second wash

Each variation gives students another example of a clear process they can describe and compare.

Example 2: Growing Plants Under Different Conditions (Everyday Biology)

Plant experiments are classic examples of 3 practical examples of science experiments because they’re cheap, visual, and easy to track over time. They also work beautifully as process essays, since students must carefully explain how they set up fair tests.

A Simple Setup With Many Real Examples

Students grow seeds (beans, peas, or fast‑germinating radish seeds) under different conditions. Some real examples of variables they can test:

• Light vs. dark
• Tap water vs. salt water
• Room temperature vs. a cooler or warmer spot
• With fertilizer vs. without

The basic procedure:

1. Plant seeds in identical cups or small containers with soil.
2. Change only one variable (for instance, one plant in sunlight, one in a dark cabinet).
3. Water and observe daily for 1–2 weeks.
4. Measure growth and record data.

The process essay then describes exactly how they set up their test, what they did each day, and what they observed.

Connecting to Real Science and Current Trends

Plant growth experiments can connect to big 2024–2025 topics like:

• Climate and weather changes: How might temperature affect plant growth?
• Urban gardening and food security: How can people grow food in small spaces or poor soil?
• Indoor air quality: Many classrooms now keep plants to help with air freshness and mood.

Students can compare their findings with general plant‑care advice from sources like university extensions (for example, University of Illinois Extension or Cornell Garden-Based Learning).

To strengthen the process essay connection, ask students to:

• Write their steps as if someone in another school had to repeat the experiment exactly.
• Use precise measurements: “I added 2 tablespoons of water every other day” instead of “I watered it sometimes.”
• Describe what they would change next time.

You now have another of your best examples of a practical, repeatable science experiment that doubles as a rich writing assignment.

Example 3: Baking Soda and Vinegar Reactions (Chemistry You Can See)

If you want an example of a science experiment that instantly grabs attention, this is it: baking soda plus vinegar. It fizzes, it bubbles, and it’s safe enough for most classrooms and homes.

This classic reaction is one of the best examples of 3 practical examples of science experiments because it’s easy to vary. Students can test:

• Different amounts of baking soda
• Different amounts or temperatures of vinegar
• Different container shapes (wide bowl vs. narrow bottle)

Turning the Reaction Into a Clear Process Essay

Students can design a simple question: “How does the temperature of vinegar affect the height of the foam?” or “How does the amount of baking soda change the reaction time?”

Then they:

1. Measure specific amounts of baking soda into containers.
2. Measure and heat or chill vinegar to different temperatures (for example, 40°F, room temperature, and 90°F).
3. Pour vinegar into each container and observe the reaction: height of bubbles, how quickly they rise and fall, or how long the fizz lasts.

This gives students a perfect structure for a process essay:

• Purpose: What are we trying to find out?
• Materials: What exactly did we use?
• Procedure: Step‑by‑step instructions.
• Results: What happened, with numbers if possible.
• Explanation: A simple note that baking soda (a base) reacts with vinegar (an acid) to produce carbon dioxide gas.

For extra support, you can pull background information from undergraduate‑level explanations, like those provided by chemistry departments at universities such as MIT OpenCourseWare or Khan Academy (not .edu, but widely respected), then simplify the language for your students.

More Examples of 3 Practical Examples of Science Experiments (Quick Variations)

Once students understand these three core experiments, you can easily add more examples of practical science activities that work well as process essays. Here are several real examples you can weave into your lessons:

Density and Floating: Salt Water vs. Fresh Water

Students test whether objects (like eggs or grapes) float differently in plain water compared to salt water. This is a strong example of a process they can explain step by step:

• Mix specific amounts of salt into water.
• Place the same object into each cup.
• Observe whether it sinks or floats.

Simple Water Filtration

Using gravel, sand, and cotton or coffee filters, students build a basic water filter and pour dirty water through it. They describe:

• How they layered the materials.
• How many times they filtered the water.
• How the water looked before and after.

You can connect this to real‑world issues of safe drinking water and reference sources like the U.S. Environmental Protection Agency (EPA) (epa.gov) for information on water quality.

Sound and Vibration With Rubber Bands

Students stretch rubber bands over a box and pluck them to explore how thickness and tension affect sound. This gives another example of a repeatable, step‑based process:

• Change only one variable (tightness or thickness).
• Describe the sound changes in words (higher, lower, louder, softer).

All of these are real examples that fit the same pattern as your original examples of 3 practical examples of science experiments: clear setup, simple steps, visible results, and lots of chances to practice transition words and explanatory language.

Helping Students Turn Experiments Into Strong Process Essays

The science is only half the story. The other half is helping students write about it clearly. Here are practical strategies to move from experiment table to finished essay.

Use the Experiment as a Built-In Outline

Instead of handing out a blank essay prompt, give students a structure that mirrors the experiment:

• Introduction: One or two sentences about the question they asked.
• Materials: A short paragraph listing what they used.
• Procedure: Several sentences describing each step in order.
• Results: A paragraph summarizing what happened.
• Conclusion: A short reflection on what they learned or what they would change.

You can even have them label their paragraphs this way at first. Over time, they can blend sections more naturally.

Model Language for Process Writing

Students often know what they did but struggle to explain it clearly. Use sentence frames like:

• “First, I…”
• “Next, I…”
• “After that, I observed that…”
• “Finally, I concluded that…”

When you’re teaching the best examples of 3 practical examples of science experiments, pause after each major step and have students say or write what they just did using these frames. This turns the experiment into a verbal rehearsal of their essay.

Encourage Simple, Accurate Science Explanations

Students do not need to sound like college researchers. A clear, short explanation is better than a long, confusing one. You can:

• Provide short readings from trusted sites like NIH (nih.gov) or Harvard (harvard.edu) for background.
• Have students highlight one or two key sentences and rephrase them in their own words.

For example, after the handwashing experiment, a student might write: “Soap helps break up the oils on our skin, which makes it easier to wash away germs.” Simple, accurate, and easy to grade.

Adapting These Experiments for 2024–2025 Classrooms

Teaching has changed a lot since 2020, and so have classroom setups. Fortunately, these examples of 3 practical examples of science experiments work in multiple formats.

In-Person Classrooms

• Set up stations: One for handwashing tests, one for plant setup, one for baking soda reactions.
• Rotate groups and have each group write a process paragraph for their station.
• Combine group paragraphs into a class “lab manual.”

At-Home or Hybrid Learning

• Choose experiments that use household items: baking soda, vinegar, cups, seeds, soap.
• Provide digital handouts with clear safety notes and step‑by‑step instructions.
• Ask students to submit photos of their setups along with their process essays (if allowed by school policy).

Differentiation Across Grade Levels

• Upper elementary (grades 4–5): Focus on listing steps in order and using transition words.
• Middle school (grades 6–8): Add variables, data tables, and short explanations of why results happened.
• Early high school (grades 9–10): Include hypotheses, controlled variables, and brief connections to scientific concepts like density, osmosis, or chemical reactions.

These adaptations help you use the same core examples of experiments across multiple grades while gradually raising the writing expectations.

FAQ: Examples of Practical Science Experiments for Process Essays

What are some other examples of simple science experiments students can explain in a process essay?

Other strong examples of simple experiments include making a homemade barometer to track air pressure, testing paper towel absorbency with measured amounts of water, or comparing how fast ice melts in salt water vs. fresh water. Each one has clear steps and visible results, which is exactly what you want for a process essay.

How many steps should a process essay about an experiment include?

There’s no fixed number, but most student‑level experiments work well with 5–10 clear steps. The key is that another person could repeat the experiment by following the essay. If someone can’t reproduce your examples of 3 practical examples of science experiments from the writing alone, the steps need to be clearer.

Can I use real data and graphs in a process essay?

Yes, and you should encourage it. Students can include simple tables or describe their data in sentences: “The plant in sunlight grew 4 inches taller than the plant in the dark.” Graphs are especially helpful for experiments like plant growth or repeated baking soda tests.

Are these experiments safe for younger students?

The handwashing, plant growth, and baking soda‑and‑vinegar experiments are generally considered safe with supervision. Always check your school’s safety guidelines and adapt materials as needed. When in doubt, look for safety recommendations from reputable science education resources, such as university outreach programs or government science education pages.

By using these examples of 3 practical examples of science experiments—handwashing and germs, plant growth under different conditions, and baking soda‑and‑vinegar reactions—you give students something better than a random writing prompt. You give them a real process to follow, observe, and explain.

That combination of hands‑on science plus clear, step‑by‑step writing is what turns a basic assignment into a confident, “I actually understand this” moment for your students.