Stealth Monitoring is North America's leading provider of remote live real-time video surveillance security camera monitoring, helping businesses security ...

The Taser is one of several use-of-force weapons that police officers may use to subdue or restrain an individual, to reduce the risk of injury or death to both ...

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.

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.

The Thirty-Eighth Annual Conference on Neural Information Processing Systems. Vancouver Convention Center. Tuesday Dec 10 through Sunday Dec 15.

The LibreTexts libraries are Powered by NICE CXone Expert and are supported by the Department of Education Open Textbook Pilot Project, the UC Davis Office of the Provost, the UC Davis Library, the California State University Affordable Learning Solutions Program, and Merlot. We also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and 1413739. Legal. Accessibility Statement For more information contact us at info@libretexts.org.

Shop Target for Ear Care you will love at great low prices. Choose from Same Day Delivery, Drive Up or Order Pickup. Free standard shipping with $35 orders.

Browse, edit, and share your picture-perfect moments. Photos is the home for all of your amazing photos and videos, and it's smart and personal, ...

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:

Jul 2, 2024 — Radar Speed Signs is an Australian designed and manufactured Radar Speed Sign with industry leading innovative features, from traffic data ...

Sep 18, 2020 — Every dollar spent on police cameras means less money for crime prevention, social supports, and police education.

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 (> \(60^\text{o} \text{C}\)).

\(^4\) 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.

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.

Support on Patreon | About AmpWhat | Unicode Blocks | World Languages | Privacy Policy | © 2011-2024 NDP Software and Andrew J. Peterson. All Rights Reserved.

2024211 — In this blog post, we'll navigate you through the crucial steps of setting up a private security company, from the foundational groundwork to the operational ...

Though Class 8 corrosive substances may generate solid wastes, they are more commonly liquids, in the form of acid solutions and alkaline or base solutions. The ...

Taser ... The term Taser was initially TASER, abbreviating Thomas A. Swift Electric Rifle after the 1911 novel Tom Swift and His Electric Rifle. The acronym ...