• Pixel-art Summitbrew, the High-Altitude Brewer, on a black mug with the slogan "AT 4200 M, MY COFFEE NEVER GETS HOT ENOUGH."

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Summitbrew, the High-Altitude Brewer Mug

\[\frac{dp}{dT} = \frac{L}{T\,\Delta v} \approx \frac{L\,p}{R_w T^{2}}\]
$21.99 USD
$21.99 USD
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Size

Boiling point drops with pressure; at ~4200 m (≈ 61 kPa) water boils near 86–87 °C.

The joke: Mountaintop observers know. The slogan on the mug reads AT 4200 M, MY COFFEE NEVER GETS HOT ENOUGH.

Source: IAPWS-IF97 saturation tables; Clausius–Clapeyron.

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

Boiling point drops with pressure; at ~4200 m (≈ 61 kPa) water boils near 86–87 °C.

The joke: Mountaintop observers know. The slogan on the mug reads AT 4200 M, MY COFFEE NEVER GETS HOT ENOUGH.

Source: IAPWS-IF97 saturation tables; Clausius–Clapeyron.

Equations

\[\frac{dp}{dT} = \frac{L}{T\,\Delta v} \approx \frac{L\,p}{R_w T^{2}}\]
\[p \approx 61\ \text{kPa} \;\Rightarrow\; T_{\text{sat}} \approx 86\ ^\circ\text{C}\]
SymbolMeaningUnit
\(p\) saturation pressure \(\mathrm{Pa}\)
\(T\) temperature \(\mathrm{K}\)
\(L\) latent heat of vaporisation \(\mathrm{J/kg}\)
\(\Delta v\) specific-volume change \(\mathrm{m^3/kg}\)
\(R_w\) specific gas constant of water vapour \(\mathrm{J/(kg·K)}\)
\(T_{\text{sat}}\) boiling (saturation) temperature \(\mathrm{K}\)

Sources

  1. IAPWS-IF97 saturation tables
  2. Clausius–Clapeyron

Field notes

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