Kjeldahl flask

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The Kjeldahl flask is a small pear-shaped flask with a long neck that is primarily used in the Kjeldahl method[1].


The Danish chemist Johan Gustav Christoffer Thorsager Kjeldahl invented[2] the flask that bears his name in 1888 in order to facilitate a method (the Kjeldahl method) that he invented in 1883. Here is his original drawing of his flask (on the left) in his 1888 publication:

Here is a photograph[3] of a Kjeldahl flask:


Here is a portrait[4] of Johan Kjeldahl: