What happens when you put your hand over a candle?

Burning is a chemical reaction. “Heating up” is a chemical process. When you swipe your finger through a candle flame, in order to feel pain, your hand has to warm up enough to trigger a neuron to send a pain signal to the brain. To do that, thermal energy must transfer from the flame into your skin.

Why can you not keep your hand above a burning candle but can do so on the side of the flame?

Why can you not keep your palm above a burning candle but you can keep it on the sides of a candle flame? Answer: This is because the hot air from the candle rises up and is hotter whereas on the sides, there is no hot air.

Why does it feel hot when you put your hands above a burning candle?

The heat from the candle is reaching your hand by radiation. Move your hand in closer to the candle. What happens to the hand? It gets warmer because the radiant heat did not have to travel as far.

Why it is easier to keep the hands around a flame sideways than on the top of it?

Answer : Hello , It is simple that we can keep our palms on the sides of candle because the hot air rises up , it doesn’t move sideways.

How do Flames move?

On Earth, gravity determines how the flame burns. All the hot gases in the flame are much hotter (and less dense) than the surrounding air, so they move upward toward lower pressure. This is why fire typically spreads upward, and it’s also why flames are always “pointed” at the top.

Can u have a fire in space?

Inside you have the same air mixture as on Earth, but because gravity is millions of times smaller an open flame behaves significantly different. In space, of course, you can’t have any fires because there isn’t any oxidizer (i.e. oxygen) to sustain the combustion process.

What if you fired a gun in space?

Fires can’t burn in the oxygen-free vacuum of space, but guns can shoot. In space, “it would be an expanding sphere of smoke from the tip of the barrel,” said Peter Schultz an astronomer at Brown University who researches impact craters.

Why is fire so bad in space?

In low gravity situations, there is no buoyancy from flames. Convection, the movement of air, is an important way that heat is transferred to other spaces. Without air, fires don’t spread as rapidly. The flame’s unusual shape creates different amounts of soot, smoke or harmful gases.

Would a fire extinguisher work in space?

In the movie Gravity, Sandra Bullock uses a fire extinguisher to maneuver in space. Because a fire extinguisher shoots out gas (normally to put out a fire), it can also be used to produce thrust and help you maneuver in space. …

Can you light a fire on the moon?

“The fuel and oxidizer in a match head would cause the tip to burn, but not for long because of lack of oxygen.” And in the moon’s complete lack of atmosphere, a match cannot ignite at all — explanation enough for why Neil Armstrong didn’t celebrate his step onto the lunar surface with a candlelight dinner.

Does water increase fire?

Water puts out fire by creating a barrier between the fuel source and the oxygen source (it also has a cooling effect which has to do with the energy required to convert liquid water into water vapor). It does this because it is a completely, 100% oxidized material. This smothers the fire.

Is making napalm illegal?

It is not illegal to make napalm in your garage, it is just illegal to use it against civilians under international law. Using it against enemy troops in wartime is perfectly OK. The history of napalm goes back to Greek Fire, which was a form of napalm.

Is napalm banned?

Napalm was also used against Japan in WWII. Its use on civilians was banned internationally in 1980 by the U.N.

How many people have died from napalm?

Yet, when 690,000 pounds of napalm was dropped on Tokyo on March 9, 1945, some 87,000 people perished in what was the single deadliest night in the war and the opening round of an incendiary campaign against Japan’s largest cities that in 10 days saw 18.7 million pounds of napalm and ex- in 1942 to plosives incinerate …

Why did the US stop using napalm?

Because napalm sticks to kids. On a realpolitik level, napalm was banned by the 1980 UN Convention on Certain Conventional Weapons as an incendiary weapon with indiscriminate effects. The US signed an international treaty to not use napalm after the end of the Vietnam war.

Is napalm used today?

But John Pike, director of the military studies group GlobalSecurity.Org, said: “You can call it something other than napalm but it is still napalm. It has been reformulated in the sense that they now use a different petroleum distillate, but that is it. The US is the only country that has used napalm for a long time.

Does napalm cause cancer?

By-products of flaming napalm include high levels of carbon monoxide and carbon dioxide that can lead to toxicity. Some types of napalm use polystyrene chemicals that convert to styrene which is a neurotoxin and likely carcinogen.

How does Agent Orange kill you?

Short-term exposure to dioxin can cause darkening of the skin, liver problems and a severe acne-like skin disease called chloracne. Additionally, dioxin is linked to type 2 diabetes, immune system dysfunction, nerve disorders, muscular dysfunction, hormone disruption and heart disease.

Can esophagus cancer be caused by Agent Orange?

Respiratory cancers, such as cancers of the lung, bronchus, larynx, or trachea, are listed as diseases that have been associated with Agent Orange exposure. Esophageal cancer is not, however, listed as a disease associated with herbicide exposure for purposes of the presumption.

Why is napalm so dangerous?

Napalm is an enormously destructive weapon. It’s very sticky and can adhere to the skin even after ignition, causing terrible burns. Napalm can cause death by burns or asphyxiation. Napalm bombs generate carbon monoxide while simultaneously removing oxygen from the air.