Ice Block

"if the ice melts level of water will be"

Colder.

Here are six suggestions:

a) The water level will rise.
b) The water level will remain the same.
c) The water level will fall.
d) None of the above.
e) Some of the above.
f) All of the above.

Hmm, a nice little multiple-choice test....

Don't overthink it. Does water expand or contract as it freezes?

If you take a look at some of OP's other questions, you may discover that he likely doesn't know the answer to your "good answer".

My own preference is to drink the water before the ice melts. Therefore my personal experience in the matter is of no help to the OP. Unless I can convince him to go ahead, drink some, and the level will surely fall.

Rather than leave everyone hanging in suspense, the answer is b) the water level stays the same. (Unless we do the artsmith thing and drink some of it!)

Tornado

That's only the case if the ice block is floating in water. OP may have meant that, but what he said was "An ice block submerged in the water" so presumably held underwater somehow. In that case the water level will fall.

Cheers..........Codey

Anybody that has experienced frozen pipes knows that water expands as it freezes. As the ice melts, the water level will decrease.

Wrong.

It is true that the melting ice contracts--precisely into the volume of the originally submerged portion. This leaves surrounding water level the same as before.

To be a bit on the criticism side, OP didn't formulate correctly the problem:

An ice block, frozen from the same water where is going to be immersed....

And now, if the final temperature in the container is 4 degrees C, at which water has maximum density, the level will decrease! For different temperatures, go to tables. (Where are our physicists?)

You have a bucket of water.

You take a block of ice and completely submerge it in that water.

You measure the water mark on the bucket.

After the ice melts completely, measure the water mark again. It will be slightly lower. The volume will be less.

The volume of liquid water is 91% of the volume of frozen water. If you used a big chunk of ice, relative to the amount of water, the difference will be substantial.

Because it was resting on the bottom, or because the 'full system' is cooler, so contracted?

There is another good one like this, that involves a water filled flask and riser tube.

Not necessarily resting on the bottom, but due to the word submerged, below the surface, in any case; however it is kept there.

Since we don't know the original water temperature, the density of the water can't be taken into consideration. Although that would also have an effect, it would be minor compared to the phase change from ice to water.

You just moved the goal posts. The original situation had the ice block floating, not submerged. The amount of ice above the water is the same amount that the block shrinks as it melts. Further temperature change could raise or lower the water level, but within the basic terms of the problem, it remains the same.

I don't believe I moved any goal posts at all. The original post reads thus "dear all, i have an doubt. An ice block submerged in the water, if the ice melts level of water will be?

"Submerged" is stated in the second sentence. The word "floating" is no where to be seen. Nor is it implied.

Maybe I missed my target.

I doubt that we will ever know, but I bet that the OP's usage of "submerged" is not what he/she really meant. Who or what would be depressing the ice block until it was actually submerged? But given that interpretation, you are perfectly correct. Nice catch, and GA!

Thanx. But I'm thinking OP may have meant actually submerged for the following reason: He was trying to wrap his head around the fact that the level would actually go down; which simply seems odd and unnatural.

But we'll only know if he tells us his intent.

You might be right about the OP's intent, but the submerged block problem seems too trivial to be of interest. The ice block melts/shrinks, so of course the water level goes down. That's just too easy.

On the other hand, for a floating ice block, it is tempting to think that when the block melts, the portion of the block formerly above water level then increases the water level. (I would bet that this is what the OP expects.)

Instead, the cute thing is that the above-surface protrusion of the ice block just matches the shrinkage of the ice block as it melts. (Unless further warming/cooling throws things off.)

Ok #13 was perhaps too 'cryptic'

In the scientific version; ice is added to a Pyrex vessel of water at room temperature. The ice is 'floating' or suspended by it's buoyancy.

The level is noted and contents left - usually covered to limit evaporation - and/or stirred to speed the 'system' returning to room temperature. The level is then noted and found unchanged.

"Unchanged" is therefore the science result.

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If the question is alluding to polar sea ice and 'flooding' - the outcome will be substantially per the 'science result' for 'sea ice'.

Or a rise will only occur due to ice on land melting.

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However in both 'World' and 'science'; at any other stage before 'room temperature' the level may be above or below the original due to temperature effects on the water body or vessel characteristics.

For example;

If one were to conduct the 'science' version using a - say aluminium bucket, a further distortion 'during' the experiment would be raised level due to the cooled bucket reducing in circumference - so volume.

If you were to add room temperature water to a bucket of -20⁰C ice - the expansion of the bucket would give a 'lower level'.

As would evaporation, in a vessel left uncovered.

As would, in the 'scientific' version, if the solution attained 4⁰C and the 'result' was taken at that point.

I hope this makes clear where and how, many strange opinions originate in "blog-science" and are repeated by "salubrity-scientists"

Some of that was as clear as a bell; some was as clear as mud. Alas, the poor reader has to figure out which was which.

Ok, ok, so which is the "mud" bit?