Flammability meaningin chemistry

Yeah, it’s a crazy history! I think some French guys made the first unmanned balloon back in the 1700s. Not exactly a ‘drone’ like we know today, but still a start.

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Flammabilityexample

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As combustion is a reaction in the vapor phase, liquids with low boiling points (< \(40^\text{o} \text{C}\)) tend to have low flash points and autoignition temperatures as they have significant vapor pressures (Table 1.7). All low boiling liquids should be treated more cautiously than liquids with moderate boiling points (> \(60^\text{o} \text{C}\)).

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Lior said: Yeah, it’s a crazy history! I think some French guys made the first unmanned balloon back in the 1700s. Not exactly a ‘drone’ like we know today, but still a start.

In some contexts, the choice of what heat source to use is critical while in other contexts several could work equally well. The choice of which heat source to use depends on several factors:

@Tate Yep, he was born in Baghdad and raised in Israel. He moved to the U.S. and started a company called Leading Systems. That’s where he created a prototype drone called the Albatross.

From what I remember, Abraham Karem is the guy credited with the modern drone. He started working on UAVs in the 1970s. His work basically led to the Predator drone, which is huge in military history.

I read somewhere that the U.S. military used drones way back in WWII. They had these drones for training anti-aircraft gunners. Can anyone confirm?

Didn’t Tesla try making a radio-controlled boat or something? I heard he played around with remote control tech way before UAVs were a thing.

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Yep, that’s right. Tesla made a radio-controlled boat in 1898! It wasn’t in the air, but it definitely set the groundwork for remote control tech used in drones.

Another important property in discussing flammability is a liquid's autoignition temperature: the temperature where the substance spontaneously ignites under normal pressure and without the presence of an ignition source. This property is particularly insightful because it does not require a flame (which is often avoided in the organic lab), but only a hot area. A hotplate surface turned up to "high" can reach temperatures up to \(350^\text{o} \text{C}\).\(^3\) Safety note: as diethyl ether, pentane, hexane, and low-boiling petroleum ether have autoignition temperatures below this value (Table 1.7), it would be dangerous to boil these solvents on a hotplate as vapors could spill out of the container and ignite upon contact with the surface of the hotplate. In general, caution should be used when using a hotplate for heating any volatile, flammable liquid in an open vessel as it's possible that vapors can overrun the hotplate's ceramic covering and contact the heating element beneath, which may be hotter than \(350^\text{o} \text{C}\). It is for this reason that hotplates are not the optimal choice when heating open vessels of volatile organic liquids, although in some cases they may be used cautiously when set to "low" and used in a well-ventilated fume hood.

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Hey guys, I was reading up on drone history and was surprised to learn that drones go way back! Apparently, they started as simple unmanned balloons and have evolved a lot. Does anyone know more about how they came to be and who was behind all this tech? image730×487 31.1 KB

Flammabilityin a sentence

As safety is an important factor in making laboratory choices, it's important to consider the flammability of the liquid to be heated. Almost all organic liquids are considered "flammable," meaning they are capable of catching on fire and sustaining combustion (an important exception is that halogenated solvents tend to be non-flammable). However, this doesn't mean that all organic liquids will immediately ignite if placed near a heat source. Many liquids require an ignition source (a spark, match, or flame) in order for their vapors to catch on fire, a property often described by the liquid's flash point. The flash point is the temperature where the vapors can be ignited with an ignition source. For example, the flash point of \(70\%\) ethanol is \(16.6^\text{o} \text{C}\),\(^2\) meaning it can catch on fire at room temperature using a match (Figure 1.38). A Bunsen burner is an excellent ignition source (and can reach temperatures of approximately \(1500^\text{o} \text{C}\)),\(^3\) making burners a serious fire hazard with organic liquids, and a heat source that should often be avoided.

Sawyer said: @Tate Yep, he was born in Baghdad and raised in Israel. He moved to the U.S. and started a company called Leading Systems. That’s where he created a prototype drone called the Albatross.

Flammabilityphysical or chemical

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Yep, they did! The U.S. had something called the Radioplane, which was used to train anti-aircraft gunners during the war. They made over 9,400 of these for practice.

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Flammabilitysynonym

\(^4\) Data from Handbook of Chemistry and Physics, 84\(^\text{th}\) ed., CRC Press, 2003-2004, 16-16 to 16-31. Petroleum ether autoignition temperature is from the SDS.

Kirin said: Didn’t Tesla try making a radio-controlled boat or something? I heard he played around with remote control tech way before UAVs were a thing.

Good question! The British Royal Navy made a drone in 1935 called the ‘Queen Bee’ for target practice. People think that’s why they started calling UAVs ‘drones’.

@Wilkie For sure. They actually produced a lot more Radioplanes after the war too, like around 60,000 of an updated model. Really popular tech for training.

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Flammabilitypronunciation

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Sawyer said: From what I remember, Abraham Karem is the guy credited with the modern drone. He started working on UAVs in the 1970s. His work basically led to the Predator drone, which is huge in military history.

This page titled 1.4A: Methods and Flammability is shared under a CC BY-NC-ND 4.0 license and was authored, remixed, and/or curated by Lisa Nichols via source content that was edited to the style and standards of the LibreTexts platform.

Didn’t Karem move to the U.S. and start a company that made drones? I think he originally came from Israel or somewhere in the Middle East.

@Feng They just sent it up to see if it’d fly, honestly. It was made of linen and silk, powered by burning wool and straw. Pretty cool for back then!

Signs for TEMPERATURE. Meaning: a degree or measure of the warmth or coldness of something. Pronunciation (sign description): Dominant forefinger (handshape)

Orin said: I read somewhere that the U.S. military used drones way back in WWII. They had these drones for training anti-aircraft gunners. Can anyone confirm?

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Lior said: @Feng They just sent it up to see if it’d fly, honestly. It was made of linen and silk, powered by burning wool and straw. Pretty cool for back then!