• Pixel-art Boundraith, the Mismatched Border Wraith, on a black mug with the slogan "EVEN HEAT HESITATES AT THE BOUNDARY."

IndexCatalogueMug

Boundraith, the Mismatched Border Wraith Mug

$21.99 USD
$21.99 USD
Promotion Épuisé
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Kapitza resistance: heat crossing a solid–liquid-helium boundary meets a thermal boundary resistance RK ∝ T⁻³ (acoustic mismatch).

The joke: Phonons mismatch at interfaces; cryo people sinter silver to fight it. Distinct from KAPITZADIRAC (live sticker). The slogan on the mug reads EVEN HEAT HESITATES AT THE BOUNDARY.

Source: P. L. Kapitza, J. Phys. USSR 4, 181 (1941); G. L. Pollack, Rev. Mod. Phys. 41, 48 (1969).

Shipping calculated at checkout by destinationMade to order, ships in ~10 days

Details

Size & material11oz · 15oz

Black glossy ceramic mug with a C-handle. Lead- and BPA-free.

  • 11oz: 0.33 l
  • 15oz: 0.44 l
CareDishwasher & microwave safe

Dishwasher safe (top rack) or hand wash. Microwave safe.

ShippingBy destination

Shipping calculated at checkout by destination.

Made to order: about 10 days of production and handling before it ships.

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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