Stethoscopes are used to listen to a person’s heart. We can make a very basic stethoscope easily using just a cardboard tube, tape and a funnel.
How to make a stethoscope
What you need:
Kitchen roll tube
Gaffer tape/ Duct tape
First try using just the kitchen roll tube. Place on a friend’s and listen. Can you hear their heart beating?
Next tape the funnel into one end of the kitchen roll. Listen to a friend’s chest again, does it sound clearer?
Make a prediction – what do you think would happen to your heart rate if you did some star jumps? hint – will the heart have to beat faster?
Trying counting the number of beats before and after some exercise. Can you record this data on a chart?
How does a stethoscope work?
Stethoscopes used by doctors consist of a chest piece, rubber tubes and earpieces. The chest piece consists of a diaphragm and bell which amplify the sound of the heart beating so the doctor can hear it.
Download our FREE stethoscope experiment printable here:
How could you make the stethoscope better? What if you used a hose with a funnel at each end? Or different sized funnels? Which do you think would work the best?
Complements KS2 Science
Learning about the body, planning experiments and making predictions.
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