[hamdani yusuf (OP)]

A definition is not an assumption.

Yes, it is. Here's an example. How do you define the color red?

[hamdani yusuf (OP)]

Here's the experiment. What do you think?

[hamdani yusuf (OP)]

My experiment tests the prediction made with following assumptions :
1. No heat flow without temperature difference.

So then you have your answer to this thread, which is, "Is there a net heat exchange between water and ice at 0 degree C?"

Are you satisfied with making assumptions without trying to confirm or refute them with evidence?

[Bored chemist]

What "assumption"?

My experiment tests the prediction made with following assumptions :
1. No heat flow without temperature difference.
2. Water-ice mixture at equilibrium in atmospheric pressure has temperature around 0 degree Celsius, irrespective of the ratio.

My experimental result indicates that at least one of them must be false.

If you were asking about your assumption(s) why did you say it immediately after quoting someone else?
Anyway, your error is in assuming that your experiment indicates that one of the assumptions is false.

The result of your experiment indicates that you have a heat leak somewhere.

[alancalverd]

How do you define the color red?

A spectrum of photons predominantly in the region of 620 - 780 nm wavelength.

[hamdani yusuf (OP)]

If you were asking about your assumption(s) why did you say it immediately after quoting someone else?

I answered your question.

[hamdani yusuf (OP)]

How do you define the color red?

A spectrum of photons predominantly in the region of 620 - 780 nm wavelength.

How did you get those numbers?
How do you define predominantly? Is 50.1% of intensity enough?

[hamdani yusuf (OP)]

The result of your experiment indicates that you have a heat leak somewhere.

Anyone can easily try to replicate my experiment. I've shown step by step process clearly.
I checked the outer surface of the container, and found it dry. No indication of water leakage nor condensation due to thermal leakage.

[alancalverd]

Here's the experiment. What do you think?

The invalid extrapolation occurs at 1:48 or thereabouts.

A domestic freezer operates at -5°C or lower, so the center of any remaining block of ice is below 0°C and the subsequent mixture cannot be considered homogeneous, nor can any chunk of ice be considered necessarily typical.

As I have pointed out several times before, heat experiments are not for the lazy or fainthearted.

[hamdani yusuf (OP)]

Anyway, your error is in assuming that your experiment indicates that one of the assumptions is false.

My experiment indicates that there is heat transfer. Otherwise the ice blocks would completely melt in around the same time.
Hence, it's impossible if both assumptions above are true.

[hamdani yusuf (OP)]

Here's the experiment. What do you think?

The invalid extrapolation occurs at 1:48 or thereabouts.

A domestic freezer operates at -5°C or lower, so the center of any remaining block of ice is below 0°C and the subsequent mixture cannot be considered homogeneous, nor can any chunk of ice be considered necessarily typical.

As I have pointed out several times before, heat experiments are not for the lazy or fainthearted.

But the aluminum sheet doesn't contact the center of the ice chunk. It touches the water.

[alancalverd]

How did you get those numbers?

It's the physical definition of "red" as you asked for. Many common adjectives are defined by numbers, e.g. 30 mph may determine "fast" in a particular context. For complex visual spectra there is an international "Pantone" scale and subsets such as BS4800 for specifying paint.

Note that "dominant" merely assumes an average human eye. Some folk can't distinguish physical or standard red signals from yellow or even blue, and the sensitivity of the "normal" eye varies with wavelength, peaking strongly in the yellow-green range, hence (a) the development of orthochromatic and panchromatic photographic films to map an image into consistently interpretable shades of grey and (b) color blindness tests for professional drivers and air crew. Interestingly, though, some forms of color blindness actually improve the detection of camouflaged structures and are prized by the military.

[Bored chemist]

Anyone can easily try to replicate my experiment.

What would be the point?

[alancalverd]

But the aluminum sheet doesn't contact the center of the ice chunk. It touches the water.

which touches the surface of the ice, which touches the middle of the ice. 

[hamdani yusuf (OP)]

But the aluminum sheet doesn't contact the center of the ice chunk. It touches the water.

which touches the surface of the ice, which touches the middle of the ice. 

What is the temperature of the water? Does it ever go below 0 degree Celsius?

[alancalverd]

Presumably not, or it would turn into ice. But it's your experiment so you should have measured the temperature of everything.The fact that any or all of the ice melts merely demonstrates that the water is above melting point and/or the ambient temperature is above melting point.

[hamdani yusuf (OP)]

Anyone can easily try to replicate my experiment.

What would be the point?

So anyone who are sceptical about my experimental result can try to falsify it or prove it themselves. If your convictions are not affected by contradicting evidences, they are not scientific.

[Bored chemist]

If your convictions are not affected by contradicting evidences, they are not scientific.

This

If heat flows from A to B then by definition A is at a higher temperature than B.
At equilibrium, by definition of "equilibrium", there is no heat flow.

is logic.
If you are not accepting it, you are not doing science.

It's not my job to find the errors in your experiment; that's your responsibility.

[Bored chemist]

Here's the experiment. What do you think?

At 5:04 you say "the difference can only be explained by..."
and that's wrong.
You are assuming that the water in the two outside compartments is all kept at 0C.
But it won't be.
The water at the bottom will warm up to 4C or so (the temperature of maximum density.)
How thick the layer of relatively warm water is will depend on how well lagged the container is.
But, in one case, the water is not only being cooled by the ice cube, it is being cooled by all the ice in the centre container.
That's why the ice which is cooled by heat transfer through the aluminium stays cooler than the ice which is insulated from that big supply of ice.

Imagine that you just put the ice and water in the middle container and left the two outer ones empty.
And then imagine that you put a thermometer in each of the two outer containers (and put the lid on).

Would you not expect the temperature in the left side to be lower than that in the right- because it is "connected" to the ice by the aluminium whereas the chamber on the right is insulated from the ice?

That's why the ice on the better lagged side melts quicker.
It's not being cooled by all that ice in the middle section.

[alancalverd]

Before leaving this thread out of sheer boredom, I will just repeat the accumulated wisdom of many generations of professional experimental physicists, including my humble self.

Heat experiments are very difficult and it takes engineering genius, cunning and patience to improve on 1% accuracy. Domestic freezers, tap water and styrofoam won't challenge the answer in the textbook. Failure with school-level or even undergraduate equipment is no disgrace, and I admire HY's enthusiasm and audacity with very simple kit, but it sometimes looks like obsession rather than science.