The blas (ancient: Spaut ) is the air breathed out by whales after diving . The air is expelled at high pressure and is saturated with moisture. When it has left the blowhole, it relaxes, whereby the moisture in the breath condenses due to the lower pressure and the lower outside temperature and becomes visible as a fountain of mist. The blower is therefore not a water fountain like a fountain , as is often shown on old drawings by seafarers.
Often times, the first thing you can tell the presence and type of whale is through the blow. The shape and size of the mist fountain also differ between species. Baleen whales have two blow holes and usually produce a V-shaped blow that can shoot up to 8 m high in right whales . The blow of blue whales and fin whales is pear-shaped and up to 5 m high, in the blue whale up to 12 m. Toothed whales only have one blowhole. In the case of the sperm whale , a toothed whale, the blow is inclined by about 45 ° to the left.
Baleen whales have two blowholes (here: blue whale )
Toothed whales have a blowhole (here: beluga whale )
Blow of a sperm whale with a typical 45 ° incline
Blow of a pilot whale (here a cub)
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- Hermann Masius: Die Thierwelt: Characteristic , p. 106 
- Wilfried Westheide, Gunde Rieger: Special Zoology. Part 2: vertebrates or skulls . 2nd Edition. Springer, Berlin 2009, ISBN 978-3-8274-2220-0 , pp. 665 .
- Wolfgang violence: whales and dolphins: top talent of the seas . Springer, Berlin 2013, ISBN 978-3-642-78205-3 , pp. 24-25 .