If you drop a hard boiled egg and a raw egg from the exact same height and at the exact same time, they will both break. So, neither is easier or harder to break. Its just that a hard boiled egg won't make as much of a mess as a raw egg when it cracks open.
Cold water.
boiling water.
An egg will cook faster at sea level because the boiling point of water is lower at higher elevations, leading to slower cooking times.
If it is in boiling water the egg will cook, but the egg will cook before the water in the egg boils.
An egg will cook faster in more hot water because a larger volume of hot water can transfer heat more efficiently to the egg, speeding up the cooking process. The increased thermal energy in the larger volume of hot water results in quicker heat transfer to the egg, leading to faster cooking.
Starting with hot water from the sink will help the water in the pot get hotter quicker.
Yes, but not by much.
An egg will sink in water but will float in salt water. An egg will sink faster in hot water than it will in cold water.
You can cook an egg without using oil by boiling it in water or by baking it in the oven.
Water + salt = a solution with a higher boiling point, which allows the eggs/pasta to cook in higher temperature. A higher temperature means that any living thing inside the egg is more likely to be killed. This makes the egg safer to eat. Additionally the egg would cook faster.
If you are looking at decreasing cooking time you would use cold water. Thermal exchange causes the water temperature to have a drastic increase. If you are just cooking the egg then it doesn't really matter.
To make a perfectly cooked tempered egg, start by bringing a pot of water to a gentle simmer. Gently lower the egg into the water and cook for about 6-7 minutes for a soft yolk. Remove the egg and place it in cold water to stop the cooking process. Peel and enjoy your perfectly cooked tempered egg.