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Any WWII veteran or someone who lived through the great depression knows the answer to this one. Use as much hot water on your face as you want. This makes the bristles stand up for a closer shave so that's good but never rinse a razor blade in any water that is not as cold as it can possibly be.
When rinsing the blade in warm/hot water the blade undergoes expansion followed by a contraction back to its normal size as the blade goes from hot back to normal temperature again. This makes the edge dull perhaps because the hot water softens the metal.
When rinsing with only cold water the blade goes in the other direction by contraction first and then expansion back to its normal size as the temperature goes from cold back to normal temperature again. This does not dull the edge.
With blades these days it is even worse. hot or even warm water will soften the polymer coating on the blade. Then when the blade expands because of the warm or hot water the polymer stretches. When it contracts again not only is the edge dull but the polymer is all wrinkled up which effectively makes the blade seem even more dull. This happens pretty much instantly and is great for companies who manufacture razor blades because the consumer has to replace the blade sooner
To test this, lather and shave only half your face with a new razor (be sure to always rinse it in very cold water). When finished this side of your face, rinse the razor several times while changing the temperature of the water from hot to cold. Now lather and shave the other side of your face. If you do not immediately notice that the blade is now more dull you will for sure notice the next time you use the razor. Mine usually last until the wife takes them in the shower. I have had some blades stay perfectly sharp for at least a few years of daily shaving.
What else can I help you with?
Does ice melt faster in cold or hot water with many definitions?
It melts faster in cold
What egg will float faster an egg with cold water or an egg with hot water?
Cold water.
Which freezes faster hot water or cold water?
Cold water will freeze faster. Because the freezing point of water is 0oC, water that is closer to that point will freeze faster then hot water. This is because it will require less time to lower the temperature to the freezing point.
Why is hot water faster to become solid than the cold water inside refrigerator?
The fact that hot water may freeze faster than cold is often called the Mpemba effect
How do cold air and hot water make the water freeze faster?
Cold air and hot water makes water freeze faster simply because the hot water is steaming and so the result is that there is less water to freeze. hot water = steam = less water less water = faster freeze cold air = faster freeze
Do flowers drink cold water or warm water faster?
cold water faster
What can freeze faster hot water or cold water?
cold water
Does cold water heat faster than hot water?
No, hot water heats up faster than cold water.
Does cold water heat up faster than hot water?
No, hot water heats up faster than cold water.
What causes sugar to dissolve faster in hot water than cold water?
hot water has faster moving particales than cold water
Why don't ice cubes melt faster in cold water?
Ice cubes don't faster in cold water because the temparature of cold water is low, ice cubes melt faster in high temparature.
Will a towel absorb hot water faster than cold water?
Cold water
Does a boat sink in hot warm or cold water faster?
It sinks faster in hot water than warm or cold
Does salt or sugar dissolve faster in cold or hot water?
Sugar sinks at the same rate in warm or cold water. Sugar dissolves faster in warm water.
Can you make ice cube faster with cold water or warm?
Cold water.
Does the experiment show that cold water boils faster than hot water?
No, the experiment does not show that cold water boils faster than hot water.
Does ice melt faster in cold or hot water with many definitions?
It melts faster in cold
