No, if the water is too hot, it can kill the yeast. The water needs to be between 90 and 110 degrees (F.)
Might be old or the water is too cold to activate it or too hot and killed it.
Very hot liquids will kill off the yeast. Only use slightly warm water to activate the yeast.
Yes, hot water can activate yeast and help it to rise. The ideal temperature for yeast activation is around 100-110°F (37-43°C). However, water that is too hot can kill the yeast, so it's important to use a thermometer to check the temperature before adding it to the yeast.
When you mix yeast and hot water, the yeast begins to activate and multiply. This is because the warm water wakes up the dormant yeast cells and provides an ideal environment for them to feed on sugar and produce carbon dioxide, which causes the mixture to bubble and ferment. This process is important in baking to leaven bread and create a light and airy texture.
yeast is an indicator of sugar. it blows up (puffs up) when it is both put in hot water
The heat provides energy for the enzymes in the yeast to work. If the water is to hot however, the enzymes will be denatured, and the yeast will not grow.
Hot dogs pretty much use the same animal parts as spam does (all of the parts nobody really wants). It is a very undesirable group of meats that are processed in to an American favorite. If the people who like hot dogs actually saw what was put into it, they wouldn't want to eat it anymore.
Yeast will produce gas if sugar, water, and warmth are available as long as the yeast is still alive. If it is too old or has been too hot and the yeast has died it won't create the gas.
Yeast can be killed with heat, that is why you use warm water to start it, not hot.
You can tell if you have killed your yeast while baking if the dough does not rise or if it does not have a light and airy texture. This can happen if the water used to activate the yeast is too hot, or if the dough is exposed to extreme temperatures.
Cooling the sugar solution before adding yeast helps prevent the yeast from being killed by the high temperature. Yeast is a living organism that is sensitive to extreme temperatures, and adding it to a hot solution can potentially kill the yeast and hinder fermentation. Cooling the sugar solution to a suitable temperature ensures that the yeast can thrive and ferment the mixture properly.
In most bread, roll and pastry recipes, the yeast has to be "proofed", which means dissolving in warm water (110 degrees), with sugar to activate (or proof) the yeast. If the yeast begins to foam up and increase in size, then it is still good. If it doesn't, then the yeast is either too old, or the water was too hot or not warm enough. If the water is too hot, it kills the yeast, and if it's too cold, it won't dissolve and activate the yeast. You can get yeast granules in individual packets, in cake form, and granules in a jar. While you can use which ever type you prefer, it's usually best to use the kind the recipe calls for, at least until you are more familiar with the different forms of yeast, and how to use them. I prefer the kind in a jar, because I it gives me more control over how much I want to use, whereas the other types don't. The most common way to proof yeast is to put the desired amount in a bowl (I warm the bowl with hot water first), then add 1/4 cup very warm water, then sprinkle about a teaspoon of sugar on top. You can stir it if you want, but it isn't necessary. The yeast should be fully proofed in about 10 minutes, and ready to add to your recipe.