• Pixel-art Endoreva, the Max-Power Engine, on a black mug with the slogan "MAXIMUM POWER. NOT MAXIMUM EFFICIENCY."

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Endoreva, the Max-Power Engine Mug

\[\eta = 1 - \sqrt{\frac{T_c}{T_h}}\]
$21.99 USD
$21.99 USD
In offerta Esaurito
Size

Curzon–Ahlborn efficiency at maximum power: η = 1 − √(Tc/Th).

The joke: Grad students run at max power, not Carnot efficiency. Distinct from the live Carnot's Ideal poster. The slogan on the mug reads MAXIMUM POWER. NOT MAXIMUM EFFICIENCY.

Source: F. L. Curzon & B. Ahlborn, Am. J. Phys. 43, 22 (1975).

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

The physics

Curzon–Ahlborn efficiency at maximum power: η = 1 − √(T_c/T_h).

The joke: Grad students run at max power, not Carnot efficiency. Distinct from the live Carnot's Ideal poster. The slogan on the mug reads MAXIMUM POWER. NOT MAXIMUM EFFICIENCY.

Source: F. L. Curzon & B. Ahlborn, Am. J. Phys. 43, 22 (1975).

Equations

\[\eta = 1 - \sqrt{\frac{T_c}{T_h}}\]
SymbolMeaningUnit
\(\eta\) efficiency at maximum power —
\(T_c\) cold reservoir temperature \(\mathrm{K}\)
\(T_h\) hot reservoir temperature \(\mathrm{K}\)

Sources

  1. F. L. Curzon & B. Ahlborn, Am. J. Phys. 43, 22 (1975)

Field notes

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