Drycrest, the Water-Vapour Hermit Mug
High sites are chosen for low precipitable water vapour; in situ TMT site testing gave median PWV of 1.86 mm at Mauna Kea 13N (4050 m) and 1.70 mm at Cerro Tolonchar (4480 m).
The joke: Mm and submm astronomers know water is the enemy. The slogan on the mug reads ABOVE THE WATER. NOT ABOVE THE DEADLINE.
Source: A. Otárola et al., PASP 122, 470 (2010).
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.
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.
The physics
Equations
| Symbol | Meaning | Unit |
|---|---|---|
| \(\text{PWV}\) | precipitable water vapour | \(\mathrm{m}\) |
| \(\rho_w\) | density of liquid water | \(\mathrm{kg/m^3}\) |
| \(g\) | gravitational acceleration | \(\mathrm{m/s^2}\) |
| \(q\) | specific humidity | — |
| \(p\) | pressure | \(\mathrm{Pa}\) |
| \(p_s\) | surface pressure | \(\mathrm{Pa}\) |
Field notes
Ver tudo-
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