My stellar padlet by Boning XUE

ziqi

bxue4_ — 2023-10-23 04:22:06 UTC

How does fire causes?

ziqi

bxue4_ — 2023-11-02 04:00:25 UTC

do not use lighters in the wild

Boning

bxue4_ — 2023-11-02 04:09:01 UTC

how fast does fire can spread

ziqi

bxue4_ — 2023-11-08 03:59:16 UTC

In less than 30 seconds a small flame can turn into a major fire. It only takes minutes for thick black smoke to fill a house or for it to be engulfed in flames. Fire is HOT! Heat is more threatening than flames.

boning

bxue4_ — 2023-11-08 04:12:12 UTC

when fuel meets fire how fast will it spread

boning

bxue4_ — 2023-11-08 04:12:31 UTC

An analysis of a dataset (n = 58) of high-intensity wildfire observations in cured grasslands from southern Australia revealed a simple relationship suitable for quickly obtaining a first approximation of a fire’s spread rate under low dead fuel moisture contents and strong wind speeds. It was found that the forward rate of fire spread is approximately 20% of the average 10-m open wind speed. The data on rate of fire spread and 10 m open wind speed ranged from 1.6 to 17 and 20 to 62 km h⁻¹, respectively. The validity of the resulting rule of thumb was examined across a spectrum of burning conditions and its performance was contrasted against that of established empirical-based fire spread models for three different grassland fuel conditions currently used operationally in Australia. The 20% rule of thumb for grassfires produced error statistics comparable to that of the fire spread rate model for grazed or cut grass fuel conditions as recommended for general use during the summer fire season in southern Australia.

Keywords:

fine dead fuel moisture content; fire behaviour; fire danger; fire prediction; fire propagation; fire safety; fire weather; grass fuel condition; model error; wind speed

ziqi

bxue4_ — 2023-11-08 04:16:28 UTC

what is the tempreture of a wild fire

ziqi

bxue4_ — 2023-11-08 04:18:52 UTC

just seconds, a spark or even the sun's heat alone sets off an inferno. The wildfire quickly spreads, consuming the thick, dried-out vegetation and almost everything else in its path. What was once a forest becomes a virtual powder keg of untapped fuel. In a seemingly instantaneous burst, the wildfire overtakes thousands of acres of surrounding land, threatening the homes and lives of many in the vicinity.

An average of 5 million acres burns every year in the United States, causing millions of dollars in damage. Once a fire begins, it can spread at a rate of up to 14.29 miles per hour (23 kph), consuming everything in its path. As a fire spreads over brush and trees, it may take on a life of its own -- finding ways to keep itself alive, even spawning smaller fires by throwing embers miles away. In this article, we will look at wildfires, exploring how they are born, live and die.

In 2000, this wildfire burned just north of Sula, Montana.

On a hot summer day, when drought conditions peak, something as small as a spark from a train car's wheel striking the track can ignite a raging wildfire. Sometimes, fires occur naturally, ignited by heat from the sun or a lightning strike. However, the majority of wildfires are the result of human carelessness.

Common causes for wildfires include:

Arson
Campfires
Discarding lit cigarettes
Improperly burning debris
Playing with matches or fireworks
Prescribed fires

Everything has a temperature at which it will burst into flames. This temperature is called a material's flash point. Wood's flash point is 572 degrees Fahrenheit (300 C). When wood is heated to this temperature, it releases hydrocarbon gases that mix with oxygen in the air, combust and create fire.

There are three components needed for ignition and combustion to occur. A fire requires fuel to burn, air to supply oxygen, and a heat source to bring the fuel up to ignition temperature. Heat, oxygen and fuel form the fire triangle. Firefighters often talk about the fire triangle when they are trying to put out a blaze. The idea is that if they can take away any one of the pillars of the triangle, they can control and ultimately extinguish the fire.

After combustion occurs and a fire begins to burn, there are several factors that determine how the fire spreads. These three factors include fuel, weather and topography. Depending on these factors, a fire can quickly fizzle or turn into a raging blaze that scorches thousands of acres.

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