Shopping on line can be easy, simple and save you lots of money. It can also take a lot of your time, frustrate you, and result in unwanted purchases. Now the same can be said for regular high street shopping, but with the vast opportunity presented by the Internet it will pay you to spend a few minutes reading this and understanding how to better optimize your Autoignition Temperature shopping experience:
1. Compare - without doubt the biggest advantage that the Autoignition Temperature offers shoppers today is the ability to compare thousands of Autoignition Temperature at a time. This is a great thing, but not necessarily all the time! Too much can be daunting at times so take advantage of the great comparison sites and where possible let them do the hard work for you.
2. Research - if it has been said it will be on the internet. Ignorance is no longer a justifiable reason for buying the wrong thing. Take the time to research in detail everything that you could possible want to know about
3. Testimonials - don't know anybody that has bought a Autoignition Temperature? Wrong! If the Autoignition Temperature is good the internet will let you know. Use the Internet as a friend and get testimonials before you buy.
4. Questions - Got a question about Autoignition Temperature then search the Forums, FAQ's, Blogs etc. Don't be afraid to ask .....
5. Reputation - Never heard of the company selling Autoignition Temperature? Don't worry, no reason why you should know every company in the world, but you know someone that does! Use the internet to find out what people are saying about Autoignition Temperature and build up a picture of their reputation for sales, returns, customer service, delivery etc.
6. Returns - still worried that even after all of the above your Autoignition Temperature wont be what you want? Check out the returns policy. There is so much competition now that someone, somewhere is bound to offer the terms that you are comfortable with.
7. Feedback - happy with your Autoignition Temperature then let people know, after all you are depending on others people input in your buying decision, so why not give a little back.
8. Security - check for the yellow padlock on the Autoignition Temperature site before you buy, and the s after http:/ /i.e. https:// = a secure site
9. Contact - got a question about Autoignition Temperature, or want to leave a comment then check out the sites contact page. Reputable companies have them and respond.
10. Payment - ready to pay for your Autoignition Temperature, then use your credit card or PayPal! Be aware of companies that don't accept them, there may be genuine reasons but given the huge amount of choice you have when buying online there is no reason at all not to buy via credit card or PayPal.
The
autoignition temperature or
kindling point of a substance is the lowest temperature at which it will
Spontaneous combustion in a normal atmosphere without an external source of ignition, such as a flame or spark. This temperature is required to supply the
activation energy needed for combustion. The temperature at which a chemical will detonate decreases as the pressure increases or oxygen concentration increases. It is usually applied to a combustible fuel mixture.
Autoignition temperatures of liquid chemicals are typically measured using a 500 mL flask placed in a temperature controlled oven in accordance with the procedure described in ASTM E659 E659 – 78 (Reapproved 2000), "Standard Test Method for Autoignition Temperature of Liquid Chemicals", ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959. The commonly accepted autoignition temperature of
paper, 451 Fahrenheit (233
Celsius), is well known because of the popular novel
Fahrenheit 451 by author Ray Bradbury (although the actual autoignition temperature depends on the type of pulp used in the paper's manufacture, chemical content, paper thickness, and a variety of other characteristics).
Autoignition equation
The time t_{ig}\, it takes for a material to reach its autoignition temperature T_{ig}\, when exposed to a heat flux q
\, is given by the following equationt_{ig} = \left ( \frac{\pi}{4} \right ) \left (k \rho c \right )\left \frac{T_{ig}-T_\infty}{q
} \right Principles of Fire Behavior. ISBN 0-8273-7732-0. 1998. where
k = thermal conductivity (W/(m·K)),
ρ = density (kg/m³), and
c = specific heat capacity (J/(kg·K)) of the material of interest. T_\infty is the temperature, in kelvins, the material starts at (or the temperature of the bulk material), and
q″ is the heat flux (W/m²) incident to the material.
Autoignition point of selected substances
- Triethylborane: -20 °C (-4 °F)
- Silane:
The autoignition temperature or kindling point of a substance is the lowest temperature at which it will Spontaneous combustion in a normal atmosphere without an external source of ignition, such as a flame or spark. This temperature is required to supply the activation energy needed for combustion. The temperature at which a chemical will detonate decreases as the pressure increases or oxygen concentration increases. It is usually applied to a combustible fuel mixture.
Autoignition temperatures of liquid chemicals are typically measured using a 500 mL flask placed in a temperature controlled oven in accordance with the procedure described in ASTM E659 E659 – 78 (Reapproved 2000), "Standard Test Method for Autoignition Temperature of Liquid Chemicals", ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959. The commonly accepted autoignition temperature of paper, 451 Fahrenheit (233 Celsius), is well known because of the popular novel Fahrenheit 451 by author Ray Bradbury (although the actual autoignition temperature depends on the type of pulp used in the paper's manufacture, chemical content, paper thickness, and a variety of other characteristics).
Autoignition equation
The time t_{ig}\, it takes for a material to reach its autoignition temperature T_{ig}\, when exposed to a heat flux q\, is given by the following equation
t_{ig} = \left ( \frac{\pi}{4} \right ) \left (k \rho c \right )\left \frac{T_{ig}-T_\infty}{q} \right Principles of Fire Behavior. ISBN 0-8273-7732-0. 1998.
where k = thermal conductivity (W/(m·K)), ρ = density (kg/m³), and c = specific heat capacity (J/(kg·K)) of the material of interest. T_\infty is the temperature, in kelvins, the material starts at (or the temperature of the bulk material), and q″ is the heat flux (W/m²) incident to the material.
Autoignition point of selected substances
