What does “bottom fermented” mean?

Lager, on the other hand, is bottom-fermented, meaning the yeast works at the bottom of the wort, at a much lower temperature.

What is bottom fermenting?

Definition of bottom fermentation

: a slow alcoholic fermentation during which the yeast cells collect at the bottom of the fermenting liquid, which takes place at a temperature of 4 to 10° C and which occurs in the production of lager beer and of wines of low alcohol content — compare top fermentation.

What is the difference between top and bottom fermented beer?

The basic difference between these two major beer classifications is how they are fermented. Ales are fermented with top-fermenting yeast at warm temperatures (60˚–70˚F), and lagers are fermented with bottom-fermenting yeast at cold temperatures (35˚–50˚F).

Why is it called bottom fermentation?

Over time, selection of yeast from the bottom of the vessel naturally favored yeast types that precipitated well, and these became known as “bottom-fermenting” yeasts. This type of yeast was finally isolated in a pure culture by Dr Emil Christian Hansen in 1883 and named Saccharomyces carlsbergensis.

Which is bottom fermented yeast?

The bottom-fermenting yeast Saccharomyces pastorianus is used to produce beer and has been proposed to be a natural hybrid between Saccharomyces cerevisiae and Saccharomyces bayanus (30).

What is top-fermenting?

Definition of top fermentation

: a violent alcoholic fermentation at a temperature of 14 to 30° C during which the yeast cells are carried to the top of the fermenting liquid used in the production of such liquors as ale, porter, and wines of high alcohol content and in distilling — compare bottom fermentation.

Is IPA top or bottom fermented?

The top-fermentation method is used for IPA makers, and the bottom-fermentation method is used for lager makers. The taste of IPAs is hoppy, and the taste of lagers is clean, well-made, and consistent. There is more alcohol in IPAs, and there are more carbohydrates and calories in it.

What is bottom and top fermentation?

Top-fermenting tends to yield more flavor, as esters (a byproduct of both kinds of fermenting) are more pronounced in warm fermenting, as are phenols (which include things like tannin). Lager, on the other hand, is bottom-fermented, meaning the yeast works at the bottom of the wort, at a much lower temperature.

Which beer is top fermented?

Ales

Ales are brewed with a top-fermenting yeast, while Lagers are brewed with a bottom-fermenting yeast.