Transcript SCIENCE SAFETY

 Before we learn how to extinguish fires, we first need
to know a little about how they work.
 The fire triangle to the right shows
the three things that must be
present at the same time in order
for a fire to occur.
 Take any of these away and
the fire will be extinguished!
Not all fires are the same.
We classify fires based on
the type of fuel they
burn.
If you use a fire
extinguisher on the
wrong type of fire you
can in fact make it worse!
Most extinguishers have a
label showing which fires
they can fight.
The extinguisher in our room is a
Dry Chemical Extinguisher used
to fight A, B and C fires.
These are filled with a fine yellow
powder and pressurized with
nitrogen.
Read the label carefully before
using to ensure it can put out the
type of fire you are fighting!
These extinguishers put out fires by
coating the fuel with a fine layer
of dust, separating the fuel from
the oxygen in the air.
They also interrupt the chemical
reaction of the fire, so they are
extremely effective!
1) Assist any person in immediate danger to safety if it
poses no danger to yourself
2) Activate the building fire alarm or call 911.
3) Only after you have done these two things should you
attempt to fight the fire if :
• You know what is burning (Remember you could make it
worse by say throwing water on an electrical or oil fire).
• The fire is no bigger than a kitchen garbage can. Bigger
fires can spread much faster than you could anticipate.
• You have an escape route that isn’t blocked.
ALWAYS KEEP AN EXIT TO YOUR BACK!!!!
It's easy to remember how to use a fire extinguisher if
you can remember the acronym PASS, which stands
for:
Pull
Aim
Squeeze
Sweep
Pull the pin.
This will allow
you to
discharge the
extinguisher.
Aim at the base of the
fire. If you aim at the
flames (which is
frequently the
temptation), the
extinguishing agent will
fly right through and do
no good. You want to hit
the fuel.
Squeeze the top
handle or lever.
This depresses a
button that releases
the pressurized
extinguishing agent
in the extinguisher.
Sweep from side to
side until the fire is
completely out. Start
using the extinguisher
from a safe distance
away, then move forward.
Once the fire is out, keep an
eye on the area in case it reignites.
Remember!!!!
Never use a water extinguisher to put
out any type of fire except type A.
Using one on an electrical fire could
electrocute you!
Using one on a flammable liquid fire
(like gas) will be ineffective and could
make it worse.
https://www.youtube.com/watch?v=6C7Yg
SpC3-Y
 Burn, baby, burn!
 Let the fire run out of fuel
 (not a good idea usually )
 Cover the fire to smother it
 Fire blanket
 Remove the heat….
 Turn off heat source
 Know where exits are – there are 2
 Exits should always be kept clear. Backpacks
should stay under desks to prevent tripping
and injury if we have to evacuate quickly!
 Never stick anything in the outlets- it can
remain stuck and cost A LOT of $ to remove.
 shutoff
1. Outlets are off if the valves are
perpendicular (at a right angle) to the nozzle.
ON
OFF
 Never stick anything in the outlets- it can
remain stuck and cost A LOT of $ to remove.
 shutoff
1. Outlets are off if the valves are
perpendicular (at a right angle) to the nozzle.
 2. Gas and Air Master OFF switch is behind
the cart in the front.
 Make sure they are off before you touch.
 Most injuries occur because the plate is
hot even after it is turned off.
still
Don’t complete the circuit!
Don’t be a pathway to the ground.
Grounding pins in the plug, help
ground the wire and protect against
dangerous current.
Electrical shutoff: big red button
use if someone is being electrocuted!
1) Always pour acids into water. (do as you otter  )
 If anything splashes out it will most likely be water.
 Pouring water into acid can create an exothermic
reaction that explodes!
2) Always wear goggles when working with chemicals.
3) Never smell a chemical directly. Waft it with you hand
to your nose.
Eyewash
•Should be sterile, but you don’t want to
drink out of it.
•If a chemical gets into your eyes, don’t
notify me first- GO DIRECTLY TO THE
EYEWASH!
•Wash eyes for at least 10-15 minutes, even
if there is no pain or irritation.
•See uc berkely safety video…
Contacts
•Contacts can pose a greater risk of eye
injury when working with chemicals.
•Some chemicals will literally melt the
contact to your eye.
•It is strongly recommended (but not
required) that you wear glasses and not
contacts during a chemistry lab.
Fume Hood
•In the back of the room.
•All you need to know about
it, is not to mess with or
touch anything inside it.
Safety Shower
•This you must ask me to use
first, unless I’m not around.
•If you spill dangerous
chemicals onto yourself, you
will need to remove the clothes
and stand under the shower
until I say it is ok.
•Don’t worry everyone will
leave the room, and you’ll be
given a new set of clothes.
First Aid Kit
•Found in a Red Backpack up
front… you
 Locate the following and draw them on n the map of the
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classroom:
Fire extinguisher
Fire blanket
Eye wash
Safety shower
Both exists
Google cabinet
Emergency gas shutoff
Emergency electrical shutoff
Fume hood
First aid kit (in red backpack)