# How Fast Does Ice Freeze?

## How much weight does it take to break ice?

A human exerts ~8 (source) to 16 (source) psi on the ground.

A human will break through ice that is 1.1 in thick.

(Source).

It can be reasonably assumed that a polar bear, on about one inch of ice, does not weigh enough to break said ice..

## Is ice harder than concrete?

When we rub ice up against concrete the ice rubs off, so clearly concrete is the harder material. … The design compressive strength of concrete is therefore a lot less than it’s theoretical strength. With ice, there should be far fewer impurities, since ice is purely solidified water.

## How can you tell if ice is safe?

Use a tape measure to determine the depth of the ice. If the ice isn’t at least 4 inches thick do not proceed any further. Test the ice in several locations to make sure it’s at least 4 inches thick and note the quality of the ice. If the ice looks good then grab your gear and get ready to kite!

## Does hot water freeze faster?

Hot water freezes faster than cold, known as the Mpemba effect. … Evaporation is the strongest candidate to explain the Mpemba effect. As hot water placed in an open container begins to cool, the overall mass decreases as some of the water evaporates. With less water to freeze, the process can take less time.

## Can you freeze milk in ice cube trays?

You can freeze milk in any freezer-safe container. … The easiest way to freeze milk is in ice cube trays. The trays stack and don’t take up a lot of room in the freezer. Even better, once the milk is frozen (just overnight), you can transfer the cubes into a Ziploc freezer bag for even easier storage.

## How much weight can 4 inches of ice hold?

about 200 poundsAt 4” the ice is suitable for ice fishing, cross-country skiing and walking and can support about 200 pounds.

## How much force does it take to break ice?

Various sources give different expansion forces for freezing ice. Depending on its state, freezing water (or ice as temperatures continue to drop) can expand by as much as nine percent at a maximum force between about 25,000 and 114,000 psi.

## Can you freeze to death at 32 degrees?

Humans freeze to death when their internal body temperature drops below 70 degrees. It’s possible to freeze to death in 40 degree temperatures, but that’s rare.

## What is the coldest temperature a human can survive?

The coldest recorded body temperature a person has ever survived is 56.7 degrees F (13.2 degrees C), according to Atlas Obscura.

## What temperature would a human die?

44 °C (111.2 °F) or more – Almost certainly death will occur; however, people have been known to survive up to 46.5 °C (115.7 °F). 43 °C (109.4 °F) – Normally death, or there may be serious brain damage, continuous convulsions and shock. Cardio-respiratory collapse will likely occur.

## How fast does ice freeze at 10 degrees?

For 10 degrees below freezing, it would shorten to about 5 days.

## How fast does ice thicken?

An ice sheet will, in theory, grow at a rate of roughly one inch per fifteen FDDs starting from ice between 1/2″ and 3″ thick (as the ice gets thicker the growth rate decreases as a result of the thermal resistance of the thicker ice).

## At what temperature do you freeze instantly?

Last updated Aug 23 2016. Answer has 6 votes. At a temperature of minus 28oC (minus 18oF), flesh will freeze in 15 minutes or less. Response last updated by gtho4 on Aug 23 2016.

## Is clear ice stronger?

New ice is stronger than old ice. Four inches of clear, newly formed ice may support one person on foot, while a foot or more of old, partially thawed ice may not.

## Is ice thicker in the middle of a lake?

Lakes usually freeze in from the edges since the water is usually moving less on the edges. Of course if the ice has frozen to the bottom at some points then it might be thicker towards the middle, but in general I would guess that it would be thinner in the middle.

## How can you make ice cubes freeze faster?

No worries, try this trick for ice cubes that freeze quickly: fill your ice tray with hot water and put it in the freezer. This phenomenon, called the Mpemba effect, may seem backwards, but actually works reliably well. You’ll get frozen ice cubes significantly faster by starting with hot water than cold.

## Is 3 inches of ice safe to walk on?

Ice begins to be “safe” at around 4 – 6 inches thickness. Do not even walk on ice 3″ or less in thickness. However, even at a 9″ – 10″ thickness, there may be unforeseen hazards such as a flowing current underneath that is ceaselessly weakening the underside of the ice.

## Does water with salt freeze faster?

Which freezes faster, water or salt water? Answer 1: While pure water freezes at 0°C (32°F), salt water needs to be colder before it freezes and so it usually takes longer to freeze. The more salt in the water, the lower the freezing point.