Which cadaver woke? [closed]

Question

A medical examiner works in Cadaversville, a place where the dead may sometimes wake in the off hours then die once more. While awake, they are not zombies and don't eat people. They just seem to be sleepwalking and are known to initiate conversations. Luckily, the refrigeration unit in the morgue freezes the body to below 32°F if one wakes up while the morgue is closed. But every time a cadaver wakes up, the medical examiner has to cure them later so they do not reanimate. There is no way of telling if a cadaver had awoken once it dies again, and the refrigeration unit does not indicate whether or not it had to freeze.

How can the medical examiner make a simple mechanism, machine, or apparatus which would be placed within the cooler and indicate whether or not water in the mechanism (and the cadavers) has frozen?

Answer 1

For the purposes of the description, I'm going to be using measurements, but there's no real need for exact numbers in this — it's just to add clarity.

1. Find a 100ml glass.
2. Put 90ml water in the glass.
3. Top the remaining 10ml with oil.
4. Place the glass in the cooler.

When the water freezes, it will displace the oil and cause it to overflow. If the cooler is opened and the water is frozen or there is fewer than 100ml in the glass, the freezer had turned on.

Make sure the diameter of the glass is sufficiently small such that the surface tension of the meniscus does not hold the oil in.

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Alternatively:

1. Find a 100ml glass.
2. Put 50ml water in the glass.
3. Dust flour on top of the water.
4. Place the glass in the cooler.

When the water freezes, it will push the flour up the glass. As it thaws, the flour will retreat to the edges and stick at a "high-water mark". If this mark is higher than the current observed level of the water (or the water is still frozen), the freezer turned on.

Answer 2

My suggestion would be to:

Fill a completely rigid but brittle plastic bottle full to the brim with water (the bigger the better).

This would work because:

As water freezes, it expands, so if the water has frozen, it would burst the bottle. You can try this experiment at home! Since the bottle is rigid it won't bend for the ice, but since it is brittle it will crack.

Answer 3

Note: this is just a funny answer

DO NOT TRY THIS AT HOME

Have you ever put popcorn in the freezer? Well don't. Put unpopped popcorn in the freezer and it cracks open (sometimes enough to pop like under heat). Simply put, stick a bag of popcorn in the freezer. It will have the effect of showing you if the corpse froze (after all, flash-freezing will do far more popping potentials than just sticking in the freezer) and it will also make the cadaver vault smell a bit better. Plus, when the guy wakes up for a bit he'll be greeted by the smell of popcorn. It's less cruel than the smell of their own decaying flesh. Note one again, this is a humorous answer. While I have seen this work irl (I accidentally put popcorn in the freezer overnight), it isn't expected to actually serve as a cadaver-detection system. Way too many flaws, including evidence contamination.

Answer 4

He could

Place a pot of fleas under a microscope.

This would work as

Fleas would die at 32 degrees Fahrenheit. So if he wants to check if it went to that temperature he can look at the microscope to see if all the fleas are dead.

You could also

Place a small animal in there that would die at that temperature, like a type of goldfish or something.

True, this could be seen as animal cruelty, but when the world is in danger of a zombie apocalypse, I don't think anyone will complain.

Answer 5

Fill 80% of a ziplock bag with water, and place into a container. Take a stick about the diameter of the bowl and carve a very shallow bowl into one end. Balance the stick on the edge of the container with a marble in the bowl in the stick outside the container. Move the stick back and forth so it's balanced on the edge of the bowl with one end on the water bag and the other end outside the container.

If the water freezes it'll expand the water in the bag, which will tip the stick up and the marble will fall.

This is a little touchy, but it's reset-able. You could instead secure a glass rod across the bag and it would break when frozen, or do something substantially similar.

There are also freeze indicators you can buy, or you can use air pressure mechanisms since air pressure depends on temperature. Bur these seem more involved and expensive.

Answer 6

He could

Place a penny or small heavy object on the surface of the ice (within a container such a a glass)

This works

if the ice has thawed and melted again, the coin would have sunk some distance, and now be not on top

Answer 7

He could

Place a special appratus that captures pressurized air!

How does it work?

Take a pipe and connect one end with a pressure gauge and then fill the pipe with mercury(90%). Then to the other end connect a one-way air valve which only lets air inside. Make sure this is done in normal temprature. Now keep it where you want to check the temprature change. As the freezer freezes the area, the mercury will contract demanding air from one way valve...now as the temprature reaches normal, mercury will expand again but the air will not escape so indicating a reading in pressure gauge.

This method is non-destructing so, you can use this gear/equipment any number of times given that it only tells that freezing has occured but not how many times.