Yeast is a living organism, and works best in higher temperatures. The warmth gives it energy to respire faster, producing more carbon dioxide, making the dough rise.
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 yeast is in cold water, it goes dormant. If the water is too cold, though, it will kill the yeast.
Dough rises faster on a hot day because higher temperatures speed up the activity of the yeast, causing it to ferment and produce carbon dioxide more rapidly. The warmth also helps to relax the gluten in the dough, making it easier for the gas bubbles to expand and lift the dough.
Warm water is best for yeast because yeast is a living organism that likes to live in similar temperatures to humans. Put yeast in hot water and it dies, put it in cold water and it will not do its job properly (will be too cold to reproduce fast etc). Put it in water that is just right and it will thrive
If the water is too hot, it kills the yeast. It stops working and therefore wouldn't make the bread rise. If the water was too cold, it wouldn't do anything to the bread. If you use warm water, however, then it gives enough energy to help the yeast work so that the bread can rise, making you're loaf.
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.
Cold will sink to the bottom. Hot water will rise to the top.
Probably hot water.
Hot water kills yeast. If the water is to hot then the enzymes within the yeast will be denatured and unable to work. Instead warm water must be used to encourage 'growth'.
No, if the water is too hot, it can kill the yeast. The water needs to be between 90 and 110 degrees (F.)
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.
ice melts faster in hot water because the hot water is transfering the separate particles in hot