Steve Spangler Science

Heartbleed Security Vulnerability Fixed   •   Get 2 Free Sick Science! Kits   •   Free Experiments by Email

On Monday we learned about a vulnerability in the encryption technology that effects most of the internet, called Heartbleed. Our team grabbed their lab coats and leaped into action to patch the vulnerability on our site.

We are happy to announce is no longer vulnerable.

While we believe we have kept out all the bad guys, we want to make sure our customer's information is safe. We are requiring that all of our customers change their password for their accounts on

To do so, click the link below and enter in the email address associated with your account. Once you receive an email to that account, follow the simple instructions to reset your password.

Reset your password -

If you have any questions on password resetting, please call our Customer Service team and they will be happy to help you. 1-800-223-9080

If you have any questions about the vulnerability please email

As this did effect most of the internet, we also recommend that you change your passwords on all of the websites you visit.

Thank you for being an amazing customer!

-- The Team

Questions? Give us a Call: 1-800-223-9080

Singing Pipes

A great science demonstration used to teach about sound waves

Rating: 54321

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The Singing Tube is a great science demonstration used to teach students about sound waves, as the piece of metal pipe is magically made to sing. Since this demonstration requires the use of fire (a propane torch), it must be done by an adult… with a child-like enthusiasm for making science fun.

  • Piece of metal pipe about 24 inches long
  • 4 inch square piece of metal screen mesh (sometimes called gauze)
  • Propane torch
  • Stick
  • Gloves


  • Singing Pipes - Hardware Store Music
Print Experiment


  1. Fold the piece of heavy wire screen mesh several times to make it just small enough to fit in the metal tube. Use a stick to position the screen about 4 inches from the end of the tube.
  2. Use a propane torch to heat the piece of screen for approximately 10 seconds. If you could see the screen (but you can’t), it should be red hot from the torch.
  3. Remove the tube from the flame and hold it vertically. The tube should begin to “sing”. Reheat the screen when the sound stops.


  • Why does the sound stop when you cover the top of the tube with your hand?
  • Why does the sound stop when you hold the tube in the horizontal position?
  • Do you think changing the size of the tube would change the sound? How? (It’s worthwhile to make several tubes of different sizes to hear the changes in pitch.)

How Does It Work?

The scientific secret behind this demo is simple -  hot air rises. Okay, the full explanation is a little more complex, but not much. When the screen gets hot, the air molecules surrounding the screen rise. This rising hot air begins to oscillate in the tube and produces the sound. As the screen cools down, the air stops flowing through the tube and the sound stops. Changing the size of the tube also changes the pitch. Covering the top of the tube with your hand stops the flow of air and the sound stops. The same holds true when you turn the tube horizontally because the air can no longer flow through the tube. It’s fun to tip the tube over and pretend to pour the sound onto the floor or into a cup. Pretend to pour the sound back into the tube as you return it to the vertical position.

Doug Hodous from Littleton, Colorado, made a set of Singing Tubes that covered an entire octave (C to C). Instead of playing the bells during the holidays, the science department entertained the staff with songs on their Singing Tubes (I’ll bet the punch at the holiday party was spiked!).

Customer Reviews

So Cool! Review by Jenny Brown

I got the pipe from the plumbing section of the hardware store and I ordered the metal gauze from an online lab supply (very inexpensive) and it worked perfectly! The tablecloth trick worked great too (using material without a hem and a smooth bottomed plate). Thanks for all the great ideas!

(Posted on October 16, 2010)

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