You don't have to refrigerate dry yeast as long as it is still in it's packaging.
20g fresh yeast is approximately equivalent to 7g dried yeast
in a closed container and then refrigerate.
Dried yeast typically lasts for about 2 years before it expires.
Dried yeast should keep for about a year in the freezer if kept in airtight packaging.
I don't refrigerate mine because I am afraid it will absorb moisture and spoil. I bought it from a bulk bin that was neither refrigerated not airtight, but i keep it in an airtight container. You don't have to refrigerate yeast, but doing so will help keep it fresh longer.
Yeast is a leaven. A chemical reaction between the yeast and water creates tiny gas bubbles, making dough expand.
Yes, yeast (even dried yeast) is a living organism and if it is not used/activated in a given time period the yeast cells will die and the yeast will not work in baking/brewing.
If by dried you mean instant dry active you would use half the amount. So 7.5 grams.
yes,if the yeast is not the bread will come out flat, i say this with previous experience.
It is sometimes called "dried yeast". It is yeast that has had all of it's moisture removed (so that it can be stored indefinitely), but becomes active again as soon as it is dissolved in water. It is sort of the opposite of "fresh yeast", but it still gives good results when used in baking. (To use it in cooking, you should always use half of the amount of yeast that's recommended for when using "fresh yeast", since dried yeast is twice as concentrated.)
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I haven't tried this yet - maybe this afternoon, but I found this conversion on a site called 'The Gooseberry Fool', so thanks to them. Yeast: The quantity of yeast recommended to raise 225g / 8 oz flour in a standard bread recipe is as follows: * 10g / 1/3 oz fresh yeast, or * 3.5g / 1/8 oz fast-action yeast = 1.5 teaspoons fast-action yeast or * 5g / 1/5 oz dried active yeast = 2 teaspoons dried active yeast Or you could use dried yeast instead! it isn't as firm and people say that it is much easier to use.