As the weather warms up
The flying in the north ҉flocculent ҉ and ҉ double ҉ 叒 ҉ ҉ come ҉ ҉ ҉ ҉ ҉ ҉ ҉ ҉ ҉ ҉ ҉ ҉ ҉ ҉ ҉ ҉ ҉ ҉ ҉ ҉ ҉
These hairs ҉ hairs ҉ hairs ҉ hairs ҉ ;
Equally drill into everyone's nostrils
People can't "fu" suck....
Popular science time
temperature
It is the primary factor that determines the beginning of the flight of poplar catkins
Generally, only the average temperature exceeds 0°C
in order to promote the development of poplars
Calculated from January of each year
When the average temperature exceeds the temperature value of 0°C
Adds up to 480°C
A region of catkins
It is possible to enter the first flight period
After entering the first flight period
Factors such as light, humidity and wind speed
Affects the flutter intensity
Wind force 2~3
Relative humidity less than 40%
Such weather conditions
It is more conducive to the flying of willow catkins
Fires caused by catkins are not uncommon
Let's take a look at these examples
Case 1
In April 2023, a forest in Luliang, Shanxi Province, caught fire at night, covering an area of nearly 8,000 square meters. Firefighters divided into teams and worked with extinguishing fans, shovels, etc., to gradually contain the fire and eventually extinguish the fire. It is understood that the cause of the fire was a catkins catching fire, which ignited the surrounding woods.
Case 2
In April 2021, a fire broke out in a foam profile processing workshop in Botou City, Cangzhou, Hebei Province. According to the on-site investigation of the fire department, the cause of the fire was that the employees ignited the surrounding foam materials when they were cleaning up the willow catkins by ignition, but fortunately there were no casualties.
You know
Is it terrible for catkins to catch fire?
Here are three experiments
Take you to understand the dangers in depth
Experiment 1
The catkins in the hands of the firefighters, once ignited, burned in the blink of an eye, and the burning speed was extremely fast.
Experiment 2
Firefighters simulated a field scene, covering many dead branches and fallen leaves with poplar catkins and then lighting them with lighters. It can be seen that when the poplar catkins encounter an open flame, they instantly burn and ignite the surrounding combustibles. It is conceivable that if there is a strong wind, the consequences will be unimaginable.
Experiment 3
To simulate a real-life scenario to the fullest, firefighters borrowed a scrapped car and spread debris such as catkins, confetti, hay and other debris around and under the vehicle.
Firefighters lit a small pinch of catkins around the vehicle, and it took only a few seconds for the flames to penetrate under the vehicle. Two minutes later, the fire grew larger, and the smell of rubber wafted away with billowing smoke, and the vehicle was caught in flames.
Looked at the experiment above
Friends will have questions
Tiny catkins
Why can it be the "fuse" of fire?
That's because
↓↓↓
Every year in April and May
The north of the continent will usher in it
Willow flying in the sky
How to prevent "ignitors"
Let's take a look
Source: Ministry of Emergency Management of the People's Republic of China, China Fire and Rescue, China Flower News