Is there a way to test yeast and see if its still good?

Yeast is a living organism, and like all living organisms, it has a limited lifespan. The viability of yeast can be affected by a number of factors, including storage conditions, temperature, and exposure to oxygen.

To test the viability of yeast, you can perform a simple fermentation test. This test involves mixing a small amount of yeast with a sugar solution and observing the amount of carbon dioxide produced. If the yeast is still viable, it will ferment the sugar and produce gas, which will cause the solution to bubble or foam.

To perform a fermentation test, you will need the following materials:

1 tsp. active dry yeast

1/4 cup warm water (110-115 degrees F)

1 tsp sugar

A small bowl or cup

A spoon

Instructions:

1. Sprinkle the yeast into the warm water.

2. Let the yeast sit for 5-10 minutes, or until it is dissolved.

3. Add the sugar to the water and stir until it is dissolved.

4. Pour the mixture into a small bowl or cup.

5. Cover the bowl or cup with plastic wrap and let it sit in a warm place for 15-30 minutes.

6. Observe the mixture. If the yeast is still viable, it will ferment the sugar and produce gas, which will cause the solution to bubble or foam.

If the yeast does not produce any bubbles or foam, it is likely dead or inactive and should not be used.