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Pressuria

Lebedev and the Pressure of Light / P = 2I/c Physics

$4.99 USD
$4.99 USD
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Pressuria, a young armoured experimenter, sends a beam of light into a glass bell jar holding a tiny vane.

The Physics

Maxwell predicted that light pushes. In 1900 Pyotr Lebedev measured it in Moscow, shining arc light onto thin metal vanes on a torsion balance in a high vacuum (Ann. Phys. 311, 433, 1901). The vacuum and fast reversals let him separate the true light pressure from radiometer gas effects. Nichols and Hull confirmed it in the US the same years.

P = 2I/c

  • P: radiation pressure on a perfect mirror (Pa)
  • I: intensity of the light (W/m²)
  • c: speed of light (m/s)

A perfect absorber feels half as much, P = I/c. Sunlight at Earth gives only about 9 µPa on a mirror: solar sails rely on it.

Honest caveat: The factor 2 applies only to perfect reflection at normal incidence.

On the sticker

Pressuria aims a bright beam from his hand at a small vane inside a glass bell jar. Printed text: PRESSURIA with the line P = 2I/c. Pixel-art kiss-cut vinyl sticker, white, in 2″, 3″, 4″ and 6″ sizes.

Shipping calculated at checkout by destinationMade to order, ships in 2–5 business days

Details

Size3″ × 3″

3″ × 3″ kiss-cut sticker.

Shipping

Shipping calculated at checkout by destination. Printed to order for you.

Delivery times & where we ship

Returns & replacements21 days

Every item is printed to order, so we can’t accept returns or exchanges for change of mind, or if you ordered the wrong size or colour.

Print defect, misprint, damage or the wrong item? We’ll send a free replacement, or a refund if you prefer. Report it within 21 days of delivery with a photo; no need to send it back.

Full refund & replacement policy

Field notes

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