Make Beer At Home

Hydrophobicity A measure of the extent to which a molecule moves away from water; such molecules are hydrophobic. Grease and fats are hydrophobic, whereas salt is hydrophilic ("water-loving").

Ice beer Beer produced with a process that includes ice generation.

Immobilized yeast Yeast attached to an insoluble support (e.g., glass beads) that can be used in continuous processing whereby wort or beer is flowed past it.

Indirect heating Heating of a material without direct application of heat, but rather via a heat exchanger.

Infestation Condition whereby a raw material in the maltings or brewery has animal life within it, e.g., insects in badly stored barley.

Inorganic Any chemical species other than those containing carbon. (Note: carbon dioxide, despite containing carbon, is regarded as inorganic.)

Insecticide Material sprayed onto crops either during growth or storage to eliminate insect infestation.

Invisible haze Haze that registers on a hazemeter but is not perceptible to the eye; sometimes called pseudohaze.

Iron Inorganic element that can enter into beer from some raw materials (e.g., filter aids) and potentiate oxidative damage.

Isinglass Preparation of solubilized collagen from the swim bladders of certain fish, used for clarifying beer; normally referred to as "finings".

Iso- -acid Bitter component of beer derived from hops.

Isomerization The conversion of hop -acids into iso-_-acids, achieved during wort boiling.

Keg Large container for holding beer, for subsequent draft dispense by pump.