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December 3 · free experiment

Theo & Tilda’s Christmas Science

Lava Lamp Experiment

Fill a jar with oil and a little water, add food coloring, then drop in half a fizzy vitamin C tablet. Gas bubbles carry blobs of colored water up through the oil, and the blobs sink again when the gas escapes at the top.

  • Age3 and up
  • ValueEmpathy
  • ScienceDensity and floating
  • FlameNone
  • Ages 3–9
  • Kitchen materials
  • No flame, no heat
  • Tested by a physicist
Real photo from Janka’s lab: the Holiday Lava Lamp experiment
NO STOCK PHOTOJanka’s real result
December 3: Theo and Tilda’s Lava Lamp adventure

In short

  • You need: cooking oil, water, food coloring, one fizzy vitamin C tablet, a tall glass jar without a lid and safety goggles.
  • You see: colored blobs rise and sink through the oil like a real lava lamp.
  • Why: oil is less dense than water, and the tablet’s carbon dioxide bubbles lift colored water up until the gas escapes.
  • Name: Holiday Lava Lamp, with oil, water and a fizzy vitamin C tablet. Day 3 of a 24-day December plan.
Step by step

How do you make Holiday Lava Lamp?

Watch gas bubbles lift colored blobs up through oil. Here is everything from the book page, ready for your kitchen table.

What you need

  • Cooking oil (about ¾ of the jar)
  • Water
  • Pink, blue, or purple food coloring
  • 1 fizzy vitamin C tablet (no Alka-Seltzer or medicine!)
  • 1 tall glass or glass jar, without a lid
  • Safety goggles

Stay close the whole time. In the book, every step that only a grown-up may do is clearly marked.

  1. 1

    Fill the jar about ¾ full with oil, then add water until it’s almost full. Watch the water sink below the oil!

  2. 2

    Add a few drops of food coloring. The drops sink through the oil and dissolve in the water.

  3. 3

    An adult breaks the fizzy tablet in half and drops in one half. Don’t put a lid on the jar!

  4. 4

    Watch the bubbles carry colored water blobs up, then see the blobs sink again. When the bubbling stops, the adult can drop in the other half.

What’s happening?

Why does it work?

Janka Sára Molnár, physicist

Janka explainsThe same words you’ll find in the book, ready to read aloud.

Oil is less dense than water and doesn’t mix with it, so the water collects at the bottom. Water-based food coloring sinks through the oil and dissolves in the water. In water, the tablet makes carbon dioxide gas. A bubble with colored water clinging to it is less dense than oil, so it rises. At the top, the gas escapes, and the drop sinks back down.

Science words for little scientists

  • denseheavy for its size, so it sinks below lighter things
  • carbon dioxidethe invisible gas that makes the bubbles in fizzy drinks
  • bubblea little ball of gas inside a liquid
The Holiday Lava Lamp experiment in Janka’s lab
Theo and Tilda in the story “A Bubbling Lamp for Dad”
The story for December 3

A Bubbling Lamp for Dad

While decorating, Dad brought his old lava lamp down from the attic. Grandpa had given it to him when he was little. As Dad stepped off the ladder, it slipped and smashed. “No big deal. It was old anyway,” said Dad, sweeping up the pieces. Theo the Science Elf took out the trash. But something bothered Tilda. Dad had stopped whistling, and he hardly spoke at dinner. That evening, she saw him sitting by the window, near the unlit lights, turning the lamp’s empty base.

How does it end? The whole story, the activity page and four more days are in the free sampler.

Read the whole story free
The value of the dayEmpathy

What does it mean?

An empathetic person notices when someone is sad, even if they say everything’s fine. They pay attention to faces, voices, and silences.

Why is it important?

Grown-ups feel sad sometimes too, but they don’t always say so. If we notice and are kind to them, they know they can count on us.

Mini mission for the week

This week, watch your family’s faces. If someone looks sad, sit down beside them and ask how they’re doing!

After the experiment

Let’s talk about it

Ready-made questions link the story’s value to your child’s own life. There are no wrong answers, only curious ones.

  • Dad said it was no big deal. So why did Tilda want to make him a new lamp?

  • How do you think Dad felt when his lamp broke? And when he saw the bubbling jar?

  • Would you like to be like Tilda, who noticed Dad was sad? How can you tell when someone is sad?

  • Has someone at home, preschool, or school ever said they were fine but looked sad? What could you do?

Tilda’s tip: Make the lamp for someone you’d like to cheer up. Ask an adult to break the tablet in half!

Look inside

This is how Day 3 looks in the book

Real pages from the free sampler. Tap a page to see it big, then read it on a tablet or print it at home.

The story page for December 3: A Bubbling Lamp for Dad
Story page
The experiment page for December 3: Holiday Lava Lamp
Experiment page

Day 3 is one of 5 free days. The full book has 51.

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Free sampler

Can we try it first?

Of course! The first 5 days of the December plan are yours for free. Try them at home or with your group, and see if your little scientist asks for Day 6.

  • 5 cozy stories
  • 5 kitchen experiments
  • 5 activity pages
  • A note from Janka
  • A cover with your name and the 5 experiments

No printer needed. Open it on a tablet or phone and start today.

Launch prices

How much does it cost? Less than a hot cocoa.

Launch prices until December 24. Your files are ready the moment you check out.

The cover of Theo and Tilda’s Christmas Science Adventure

The Book

129 printable pages

$11.99Regular price $14.99

less than 50¢ a day in December

Get the book
  • 51 stories and 51 experiments
  • 24-day December plan
  • Story words and science words
  • Stampable two-page adventure map
  • Contents, learning index, and certificate
Best value
The cover of the Theo and Tilda Christmas Activity Pack

Book + Activity Pack

Everything in the book, plus 60+ pages of FUN

$13.99Regular price $17.99

less than 60¢ a day in December

Get the bundle
  • The complete book
  • Coloring pages, mazes, and word games
  • Puppets, ornaments, and bookmarks
  • Kindness advent calendar
  • Word cards and value talk cards

No printer? No problem. Read it on any tablet, phone or computer, and print only the pages you love.

One price for everyone. A parent can print it for Advent at home, and a preschool teacher can bring it to her group. One purchase covers one family, or one teacher with their own group or class.

Prices in US dollars. Any sales tax or VAT is calculated at checkout.

Questions and answers

Holiday Lava Lamp: what parents ask

Short answers from Janka, the physicist who tested the experiment in her own lab.

Still wondering?

Write to Janka. She reads every email herself.

molnar.janka.sara@funtasztikus-tudomany.hu
Why do we use a fizzy vitamin C tablet?

In water, the tablet makes carbon dioxide gas, and those bubbles do all the lifting. Please don’t use Alka-Seltzer or any medicine, a fizzy vitamin C tablet works just as well.

Why don’t the oil and water mix?

Oil is less dense than water and doesn’t mix with it, so the water collects at the bottom of the jar. The food coloring is water-based, so it sinks through the oil and colors only the water.

Why must the jar stay open?

The tablet makes gas. With a lid on, the gas can’t escape and pressure builds up in the jar, so always leave it open.

Can we make it bubble again?

Yes. When the bubbling stops, a grown-up drops in the other half of the tablet. The lamp starts all over again.

Which story goes with the lava lamp?

“A Bubbling Lamp for Dad”, the story for December 3. Its value is empathy: Theo and Tilda notice how Dad feels and make something just for him.