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.
Warm, not hot, water will activate yeast causing them to produce carbon dioxide which causes breads to rise
Yeast grows quicker in warmer tempratures. More yeast makes more CO2 which causes the bread to rise more.
When yeast is in cold water, it goes dormant. If the water is too cold, though, it will kill the yeast.
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.
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
Cold will sink to the bottom. Hot water will rise to the top.
Probably hot water.
If the temperature is too low, the yeast will remain dormant. If the temperature becomes too hot, the yeast organisms will be overwhelmed and killed before they can respire.
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