Why do we use road salt to melt snow and ice?
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- Опубликовано: 10 сен 2024
- Millions of tonnes of road salts are poured onto city streets each winter to help melt snow and ice. But what's the science behind this?
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Is table salt (sodium chloride) and road salt different? Sodium chloride lower the melting point of ice so how an Indian ice cream shop owner use salt in roller coaster ice cream to not melt the ice early... I couldn't find the concept clearly, please some body help me out with logic... Bcz at one hand salt is using on roads to melt the ice early, but at the other hand it use in roller coaster ice cream drum... Such a confusing situation...
agree
I would say it's about the same except road salt can have additives that help melt snow better.
See , the external temperature also matters. Yes , both the salt which is used for melting the ice in hill stations & for melting the ice not early is the same.
Let's start with hill station. Suppose the temperature of hill station is -5°C. When u put salt on ice (the freezing point of water or melting point of is 0°C) the freezing point of ice starts decreasing gradually, goes from -1 to -2 then -3 so on... When the freezing point goes to -5 or much below, it starts melting ( as the temp of hill station is -5°C)
Talking about the case of ice drums, so the icecream is first put in that drum which has ice on the outside layer & then salt is added. At that Time, let the external temperature be 40°C & assume that their are two drums, one with salt & another without salt. When salt is put in the first one, the melting point of ice decreases gradually let it go upto -10°C & the second one the ice stays in 0°C . So, which drum's ice will melt easier ? The second one will melt faster.
I hope u got my point
Does anyone know what happens to the salt once everything is done? Does it just seep into the ground or does it completely dissolve?
It probably does both.
Dissolves inside of the water and eventually seeps into the ground as runoff.
does it kill snails and slugs ?
Great video
Welp we have more help to clear these roads all around the country
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It’s the cheapest
Just use blue salt like Alaskan.. it’s literally environmentally safe and melts faster but it’s expensive so that’s why it isn’t used for the roads. Whereas normal rock salt is 7-8 dollars a bag but I’m sure the city gets it by bulk
Most of that salt comes from Louisiana. They have like 60 gigantic underground salt domes. One is beneath Avery Island, LA. Same place Tobasco hot sauce is made. It’s mined by Cargill. I interviewed with them in 2018. That mine is 2000 feet deep. The 1 World Trade Center is only 1600 feet tall. They fill up huge barges with that salt and tugboats push it up north. There’s also a huge salt dome near one of the finger lakes in NY near Ithaca. They are closing the one in Avery Island because of a recent collapse incident that happened and the one by Ithaca has 10 more years of sale left. Actually like 8.
I know how to make it safer to travel on the road in icy conditions, you dont
Anything other that salt is a worthless treatment. Lives are more important than protecting plants.
Because it melts snow when its too cold for water to melt by lowering the freezing point