We want to know how long it will take to sterilize tweezers in boiling water. Since we are dealing with a liter of liquid at 100 C, we can use the relationship between temperature and energy:
The boiling point of water is 100 degrees Celsius. The boiling point of a liquid is the temperature at which it turns into vapor.
We need to know how much energy it takes to raise the temperature of a liter of liquid by 1 degree C. The amount of energy required to heat or cool a liter is the same. This means that if we use 100 J/C to heat our water, then we will also be able to use 100 J/C (or some multiple thereof) in order cool it down again.
The latent heat of evaporation (LH) for water is . It's the amount of energy required to evaporate a gram of liquid at its boiling point, and it's the same for all liquids. The LH does not depend on temperature or volume.
The latent heat of fusion (LF) for ice is . This means that it takes to convert a gram of solid water into liquid, but it releases when this process occurs. The LF for water can be expressed as:
where `T` is the temperature in Kelvin and `m` is the mass in kilograms.
The specific heat capacity (Cp) for water is 1.00 calories per gram per degree Celsius, or 4.184 joules per kilogram per Kelvin. The latent heat of evaporation (LH) is 970 calories per gram. The latent heat of fusion (LF) is 334 joules per kilogram.
So, the energy required to boil one liter of liquid is given by .
This is the same as the energy required to heat one liter of liquid by 1 degree C. The latter may be calculated from: .
Boiling water is the best way to kill germs on tweezers. It's also the most effective method, and there's no other way than boiling water that can be used to kill germs on tweezers.
Put your tweezers in a pot of boiling water for 3 minutes.
Remove the tweezers from the pot and let them cool until they're warm to the touch, but not too hot to hold (about 30 seconds).
Rinse with cold water, then dry completely with a towel or paper towel.
After you have boiled your tweezers, let them cool in the pot for about 10 minutes.
Rinse with cold water, and then use a towel to dry them off completely.
Boiling water is the best way to kill germs on tweezers.
Place your tweezers in a pot of boiling water for 3 minutes, then remove them with tongs or another tool that won't touch the surface of your skin. Let them cool down on a paper towel so that they don't burn you when you handle them again.
In conclusion, it takes about 1.2 MJ of energy to boil one liter of water.