well they are both good
When you dip your finger into cold water, heat is transferred from your finger to the water. This transfer of heat causes your finger to feel cold.
If the beaker has a cold water, or something else cold, in it than the heat that is in our finger will run out of you finger into the cold water. This leaves your finger 'empty' of heat, giving you the sensation of being cold. You need to remember that only heat moves. When you are cold you wear a jumper that keeps the heat in your body, not keep the cool out.
Heat transfer occurred from your finger to the cold water, as heat moves from a higher temperature region (your finger) to a lower temperature region (the water) in an attempt to reach thermal equilibrium.
cold
When you dip your finger into cold water, thermal energy is transferred from your warmer skin to the cooler water. This transfer of heat occurs because heat moves from areas of higher temperature to areas of lower temperature in an attempt to reach thermal equilibrium. As your finger loses heat, you perceive the sensation of cold. The water molecules, being at a lower temperature, absorb the heat, which causes the temperature of your finger to drop.
Ice use is better for cold sores.
The thermal conductivity, and thermal capacity of iron is a lot higher than for wood. So when you touch wood, a little heat from your finger warms the wood just at that place and isn't conducted away. But for iron, it's as though your finger is trying to heat the whole piece, the heat conducts away rapidly and your finger then keeps trying to supply more until it is as cold as the iron. So the iron feels colder - just because it doesn't warm under your finger like the wood.
Heat is for therapy, cold is for swelling. If you have a swollen finger you should use ice, you should check with your doctor if the swelling doesn't go down.
Immediately after - cold; When injury subsides - heat for healing.
When you dipped your finger into the cold water, heat transferred from your warmer finger to the cooler water. This process is known as conduction, where thermal energy moves from a hotter object to a cooler one until thermal equilibrium is reached. As a result, your finger feels cold due to the loss of heat, while the water slightly warms up from the energy it absorbs.
yes
Are you trying to heal or inflict nerve damage?