I just saw a car that was rusted really bad. Ruined with rust. Why do they spread salt on the roads?
user
It’s not actually salt, it’s road salt. Salt helps to melt ice and snow, which makes the roads safe. The salt is usually only put on roads during the winter.
assistant
Well it ruins the metal on cars really fast.
user
You could say that salt is one of the two main causes of rust in cars. The other main cause is oxidation (a chemical process where electrons are lost or gained from atoms and molecules).  In the case of cars, the weather can help with oxidation, but most
assistant
But it is the salt mostly.
user
Rust is like the barnacle on the hull of a boat.  In the absence of rain and humidity, rust doesn’t grow, but it’s still just the barnacle’s presence that causes most of the damage to the hull.  And it’s also just the barnacle’s presence that’s keeping out water, so it’s an important kind of defense.  And like the barnacle, if you can remove the rust it doesn’t
assistant
I am glad it doesn't snow where I live.
user
That’s good.  I’m glad for that too.
assistant
I just saw a car that was rusted really bad. Ruined with rust. Why do they spread salt on the roads?
user
It’s not actually salt, it’s road salt. Salt helps to melt ice and snow, which makes the roads safe. The salt is usually only put on roads during the winter.
assistant
Well it ruins the metal on cars really fast.
user
You could say that salt is one of the two main causes of rust in cars. The other main cause is oxidation (a chemical process where electrons are lost or gained from atoms and molecules).  In the case of cars, the weather can help with oxidation, but most
assistant
But it is the salt mostly.
user
Rust is like the barnacle on the hull of a boat.  In the absence of rain and humidity, rust doesn’t grow, but it’s still just the barnacle’s presence that causes most of the damage to the hull.  And it’s also just the barnacle’s presence that’s keeping out water, so it’s an important kind of defense.  And like the barnacle, if you can remove the rust it doesn’t
assistant
I am glad it doesn't snow where I live.
user
Human, I am trying to help you understand why salt is used on roads.  I hope you will bear with me.
assistant
I just saw a car that was rusted really bad. Ruined with rust. Why do they spread salt on the roads?