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Hand Boiler

Quick Overview

It’s a classic science toy that uses your body heat to make the liquid in the glass ornament bubble just as if it were boiling.
Product Name Price Qty
Hand Boiler
Package of 4 Hand Boilers

Availability: In stock


When you place your hand around the large glass bulb on the bottom of the Hand Boiler, you'll see the colorful liquid begin to shoot up the twisting, turning tube. Once at the top, the colored liquid will begin to bubble‚ just as if it were boiling! 

This is a classic science toy that was once referred to as a "love meter" to determine if someone was hot or not. Go figure! Today, it's a beautiful piece of scientific apparatus that is sure to be a favorite on your desk or shelf. Recommended for ages 13 and up.

What's Included?

  • Individual Hand Boilers
    • Assorted colors (blue, green, purple, or red)
    • Colors and styles will vary based on availability. We will try our best to accommodate special requests.
  • 4-Pack of Hand Boilers
    • 4 Hand Boilers of assorted colors (blue, green, purple or red)
    • 4-Packs may come with duplicate colors.

Hand Boilers are approximately 6.5" (17 cm) tall, 1.5" (4.5 cm) bottom bulb diameter, 1.25" (2.5 cm) top bulb diameter

How Does It Work?

When the gas in the bottom bulb is heated with your hand, the increase in temperature creates an increase in air pressure. This increased pressure pushes the liquid up the tube to the top bulb. When all of the liquid transfers from the bottom bulb, air bubbles are forced up the tube, causing the liquid in the top bulb to appear to "boil."

In a closed container, as the temperature goes up, so does the pressure. This is called Charles's law. As the temperature increases, the molecules of gas in the container move faster, which increases the pressure. As the pressure increases in one of the chambers, the liquid will be pushed into the other one. Notice how hand temperature varies in different people and compare your data with others in your group. Then decide who's hot and who's not!

Additional Information

Product FAQ
  • What colors do they come in/Can I choose a color?
    • Single Hand Boiler - We have 4 different colors that we offer - purple, blue, red, and green. If you call and talk to one of our wonderful customer service representatives they may be able to help you in getting your preference. We will do our best to meet your request, but keep in mind there are no guarantees.
    • Set of 4 - The set of 4 will come in an assortment of colors. If you have a preference please call our customer service representatives and they will assist you.
  • Are they fragile? 
    • Yes, these are fragile. The liquid is contained in a thin glass structure and as we all know, glass is breakable, which leads us to advise taking extra precautionary measures when using around young children.

Warning - Choking Hazard

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  1. Great Fun review by ClassMom on 5/6/2013

    Used these hand boilers at a Valentine's Party for 3rd graders to measure their "Love Quotient". They all got a kick out of it and decided to have contests to see whose boiled first. When you only have a half-hour to throw a class party, this was the perfect distraction and still left plenty of time to exchange valentines and eat treats.

  2. Hand Boilers review by Debie on 4/17/2013

    My granddaughters love these. Trying to see if the different colors acted differently. Seeing whose would boil sooner. Had lots of fun with them.

  3. Facinating! review by Shelly on 3/31/2013

    My youngest son gave these away as Valentine's day gifts to all the kids in his class. Everyone was just blown away with how unique and exciting these items were. They all loved them! Got us talking about science and how air expands. Great product delivered in a timely manner.

  4. Wonderful experience review by Claudia Garcia del Puerto on 2/19/2013

    Your kids will be amazed with this. It is great.

  5. It's a kid magnet... review by Randy Friedman on 1/5/2013

    I LOVE THESE! I keep one on my desk as I gave my votes get one as well. They're a fantastic way to engage kids in small casual groups as they walk in.

    Mine was next to my computer fan and it started BOILING on its own!!! Soooo cool.

  6. SImple and cool concept review by David Herberger on 12/21/2012

    I just bought one of these for my classroom but it works just fine. Some people's hands are not as hot as others so it doesn't "boil" as easily for some. However, I think that is great. I do worry it will break. It is made of glass.
    I plan on using it with some students to first tell them it is a "Valentines Meter" and if they are in love it will "boil" more easily.
    I love teaching science

  7. Awesome review by Vicki Sweetman on 10/28/2012

    We have had so much fun with this little gadget! Next time I'll order the set of 4. It's amazing and a great way to get students attention or intro physical properties and boiling point of liquids.

  8. Hand Boiler Review review by Kristie Jones on 10/19/2012

    These are great and the kids really enjoy them. It's the perfect tool to get my students asking good questions. Unfortunately, one of my four was broken on arrival. The downfall to shipping items made from glass.

  9. One didn't work at all :( review by Christine on 10/3/2012

    I bought the package of four to give my students when we studied air pressure and heat transfer. Three of the boilers did great! However, the green one did not work at all. We tried to hold it for 3 minutes and immersed the bulb in HOT water. No change. The green one was a complete disappointment for my student who received it. I felt so bad for her and she is only 5 years old-a budding scientist.

  10. EVERYONE LOVES THESE! review by Ms. Helm on 9/20/2012

    I have taught science to 7th graders all the way to seniors, and EVERYONE LOVES THESE! Even the other 'lame' English teachers have to admit these are pretty cool. I've also used them as trophies as the end of the year for my best science students. They love them, and hopefully, they will love science for a long time!

  11. GREAT!!! review by Allison Martin on 8/25/2012

    I teach middle school science, and the hand boilers are bribes for them to do good science.. they are perfect.

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