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30 Cards in this Set
- Front
- Back
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Physical Science
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study of the physical world around us
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Oxidization is what type of reaction?
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Chemical reaction
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Our atmosphere is composed of what percentage of oxygen?
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about 21 percent
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exothermic reactions
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reaction that gives off energy
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endothermic reaction
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reaction that absorbs energy
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Three things that make up the fire triangle?
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Oxygen
Fuel Heat |
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4 Things that make up the fire tetrahedron?
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oxygen
fuel heat and self-sustained chemical reaction |
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Heat is a form of....?
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energy
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Energy exists in two states
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Potential
Kinetic |
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Temperature
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measure of kinetic energy
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Define Energy:
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the capacity to perform work
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BTU
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British Thermal Units
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Define BTU
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heat required to raise the temperature of 1 lb of water 1 degree F
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Two forms of ignition
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piloted ignition *something lit it
autoignition *lit by itself |
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Define Autoignition temperature
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The temperature the surface of a substance needs to be heated for ignition and self-sustained cumbustion to occur
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When electric current flows through a sonductor, what type of heating is produced?
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Resistance heating
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When electric current flowing through a conductor exceeds its design limits, what type of heating is produced?
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Overload or overcurrent
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Define Arc
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luminious electric discharge across a gap of space
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Define Sparking
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Luminous glowing particles that spatter away from arcing point
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Mechanical heating is generated by which two ways?
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Compression
Friction |
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Heat can be transferred from one object to another by three forms?
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Conduction *touching
Convection *rising air Radiation *energy in wave form |
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Passive agents
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Materials that absorb heat but do not participate activley in combustion
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What fuels contain carbon?
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Organic Fuels
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Which fuels do not contain carbon?
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Inorganic Fuels
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Most fuels are what type of fuels?
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Organic Fuels
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Most dangerous form of fuel?
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Gaseous
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Define flash point
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Temperature at which a liquid gives off sufficient vapors to ignite but not hold combustion
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Define Fire point
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Temperature at which a liquid gives off sufficient vapors to ignite and can hold combustion
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Solubility
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the extent to how substances will mix together
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Miscible materials will...
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mix in water in any proportion
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