the water taken from sea freezes at about -2 degree Celsius and boils at about 101 degree Celsius . explain the reason.
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Answer:
LAUNDRY SCIENCE 101: HOT WATER VS COLD WATER
01 AUG, 2016
There are good reasons to use cold water and good reasons to wash on hot so let’s explore why temperature is important in certain situations and clear some myths and misconceptions about washing on cold and hot water.
The cost/energy savings of washing in cold is obvious. I won’t argue with that for a second. From an economic standpoint, cold water wins hands down. From a cleaning standpoint – you may have to weigh getting clothes cleaner vs how much money you are spending per load.
In a previous post, I discussed the basic principles of washing. Lets review.
The process of washing laundry is broken into a ratio of
Time, Water, Mechanical Action, and Chemicals.
Here’s the monkey wrench – Cold water changes a few things. Cold water requires that you not only run your machine longer and/or use more chemicals (soap),but also on the drying side of things, your clothes may have to dry for longer in the dryer.
This is because cold water weighs more so natural fabrics like cotton actually soak up more water, which will add to your drying time.
Hot water is most often 10 degrees colder when it arrives at your machine from when it leaves your hot water heater. In laundry washing terms, hot water is considered to be 130 degrees Fahrenheit (54.4 Celsius) or above. Warm water is generally between 110 and 90 degrees Fahrenheit ( 43.3-32.2 Celsius). Cold water is between 80 and 60 degrees Fahrenheit (26.7-15 Celsius).
Do not use hot water for washing by hand, or you can be burned. Keep in mind the other downsides to washing on hot - hot water can fade, damage or shrink some fabrics, so make sure you read the washing instructions on your clothing labels before washing on hot.
When you are washing at 80-60 degrees Fahrenheit, soap works 70-90% less effectively within the same amount of time time as it would in warm water unless it's formulated to wash on cold. If your cold water is below 60 degrees Fahrenheit (15 Celsius), clothes are unlikely to be cleaned very well without specially formulated detergent.
You may want to try using a candy thermometer when you are running the machine to see what the temperature actually is when washing. If you are running cold loads and the temperature is below 60, tell your machine to wash on warm. Additionally, your cold temperature can change seasonally, so if you are in the frozen north, consider dialing up to at least warm to wash your clothes in the winter.
in short….
Cold Water = a need for increased wash time (or increased chemicals) and possible longer drying time.
Hot water = decreased wash time (or decreased chemicals) and possible shorter drying time
In some cases your washing machine will automatically give you a longer wash time if you select a cold cycle, but when the settings are completely up to you – if you didn’t know to increase the time when decreasing the temperature, you might be wondering why your clothes aren’t getting properly clean.
All things considered, you are most likely still saving money using cold water, even if you have to run the machines a little longer. In that regard, cold water wins. In addition, you can counteract the longer drying time by using Wool Dryer Balls. Three to Four dryer balls in your dryer will cut down on drying time. Wool Dryer balls are a one time investment that save a lot of energy and time.
To find out how much you’re actually spending per load, check out this useful resource that will allow you to enter in your machine type, settings, and everything else.