2 questions in one?

Question

Why does salt melt ice?

& Why is the grass always wet every morning?

Please tell me, I feel embarressed to not know why salt melt's ice, and why the grass is wet.

Answer 1

Salt disrupt ice crystal formation by providing ions that water molecule would rather attach to instead of forming bounds with other water molecules.

As for the grass being wet, it is the result of the high humidity in the air condensing from the lower temperature of the night.

Look up dew in Wikipedia (see link)

Answer 2

salt is highly hydroscopic and is rapidly absorbed into the ice which in turn lowers it's freezing point and causes it to melt and in turn absorb more salt

as for grass, condensation?

Answer 3

u see the grass always wet every morning. becoz it is due to guttation. Guttation occurs during humid nights when transpiration is low & there is plenty of water in soil. under these conditions, absorption of water is active & root pressure is maximum & it forces water upwards. so u noticed that droplets on grass in morning.

This water dropletcome out from special cells present in plants called water stomata or hydathodes.

Answer 4

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Answer 5

Salt and other deicing compounds melt ice by lowering the freezing point of water. Water freezes at 32 degrees.

The temperature at which water will turn to ice or ice will melt to water is lower when salt is present. You can test this at home by making a cupful of very salty water and placing it in the freezer compartment of your refrigerator.

If the temperature of your freezer is just around 32 degrees, it should not freeze. If you have a deep freezer and the temperature is well below 32 degrees, your cupful of salty water may actually freeze. Even salty water will freeze at a low enough temperature.

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Dew is water in the form of droplets that appears on thin, exposed objects in the morning or evening. As the exposed surface cools by radiating its heat, atmospheric moisture condenses at a rate greater than that of which it can evaporate, resulting in the formation of water droplets.

When temperatures are low enough, dew takes the form of ice; this form is called frost.

Because dew is related to the temperature of surfaces, in late summer it is formed most easily on surfaces which are not warmed by conducted heat from deep ground, such as: grass, leaves, railings, car roofs, and bridges.

Answer 6

The second question:  All objects radiate heat in the form of infra-red radiation.  Usually an object radiates about as much heat as it absorbs and its temperature is stable.  On cloudy nights I bet you don't notice the grass being wet.  It is because the clouds radiate heat and warm the grass.  On clear nights the grass radiates heat and cools down further that the ambiant temperature and the dew point.  There is no off-setting radiation to stablize it.  This causes water to condense.