How do you kill yeast after fermentation?

Online Answer
Add 1/2 teaspoon of potassium sorbate per gallon of mead/cider and and stir to halt fermentation. Potassium sorbate does not kill yeast, but prevents them from converting anymore sugars into carbon dioxide and alcohol.
Related Questions 📌
Vinegar can also be an undesired product in wine production. If the temperature in the fermentation vessel is too high, the Acetobacter will outgrow the yeasts and the produced alcohol will be converted to vinegar. There are bacteria that can convert sugars straight to acetic acid in anaerobic fermentation.
Add 1/2 teaspoon of potassium sorbate per gallon of mead/cider and and stir to halt fermentation. Potassium sorbate does not kill yeast, but prevents them from converting anymore sugars into carbon dioxide and alcohol.
fermentation is not done by boiling. boiling would kill the yeast. yeast need a very specific temperature range to convert sugars (wort, grape juice, honey, whatever…) to alcohol. and boiling is far above the temperature in which yeast can survive..