Decorative Radiometer - 18cm

A 18cm high lovely decorative radiometer that spins it little heart-out in sunlight.
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$39.95 Incl. GST
or 4 interest-free payments of $9.99
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A lovely decorative radiometer that spins it little heart-out in sunlight.

Consisting of a glass bulb with a partial vacuum containing a low friction spindle. When electromagnetic radiation such as light or even heat from a person's hand enters the bulb the vanes turn, the black away from, and the white towards, the source of radiation.

This hand made radiometer makes an attractive room ornament and is an interesting lesson is energy transformation.

Ages: 12+ under adult supervision, made of fragile glass

What you get

Decorative Radiometer, hand made from glass, measuring 18cm high. This is not a toy, the glass is fragile.

How does it work?

Also known as the light mill, or solar engine, the radiometer demonstrates how heat can be transformed into movement energy. Its invention in 1873 is credited to Sir William Crookes, an English physicist.

When the black vanes inside the radiometer are exposed to a warm energy source like the sun or a table lamp, they spin. The more powerful the heat source, the faster the vanes spin.

The black side of the vane absorbs heat faster than the polished silver/white side, raising the temperature and pressure of the air molecules behind the black vanes and causing the spinning motion.


  • Heat Engine (the radiometer effectively becomes a heat engine when heat energy, such as light, is directed at it))
  • Sustainable and solar energy.
  • Thermodynamics.
  • Black-body absorption the black vanes inside the radiometer heat up quickly because they absorb all radiation falling on them. This contrasts to the other white/silver side of the vanes.
  • Light energy and electromagnetic radiation.

WARNING: CHOKING HAZARD - Small Parts. Not for children under 3 years.

More Information
Length (cm) 14
Width (cm) 25
Height (cm) 14
Age Group 11-12 Years, 12+ Years
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What are the shipping costs?

FREE Shipping is available on all orders over $120 to anywhere in Australia!

Orders under the value of $120 incur a low flat rate shipping cost of only $9.95 to anywhere in Australia.

Express, Registered and International delivery options are also available. The cost for these premium shipping services will be automatically calculated during the checkout process.  Please conact us if you have any queries with these services.

In some cases we may need to apply a shipping surcharge to large or fragile items, especially to remote or non-urban locations. You will be contacted by us for confirmation if this additional charge is applicable.

How long will it take for my order to arrive?.

You should receive your order within 2 to 4 working days, although to some regional and out back areas it can take up to 2 working days longer. Orders going to WA also take a little longer, up to 6 working days.

All standard orders are shipped using Australia Post's eParcel service, so you'll be kept fully informed of the progress of your order during its journey to you. Aside from receiving regular email updates, you can enter your tracking number into Australia Post's website at any time for information about the delivery status of your order.

International delivery will take from between 1 to 4 weeks depending on the destination and potential customs clearance delays.

When will my order be shipped?

We ship every Victorian business day. Orders received and paid for by 12pm AEST time will generally be shipped the same day.

If you require your order urgently, we have a next day delivery express service available.

What locations do you ship to?

We ship to both Australian and International customers.

What shipping options are available?

The majority of orders are shipped using Australia Post's trackable eParcel service, with larger orders being sent by national courier.

We also have options for express or registered post. A number of international delivery options are also available. These can be selected during checkout.

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