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Sagot :
1. Oxygen, heat, and fuel
These three things that must be present for a fire to exist.
2. (a) In order to put out the fire, it achieves this by removing the heat from it.
(b) Water can also be used to separate the fire from the oxygen source.
(c) It smothers it, preventing it from igniting more airborne oxygen.
Water extinguishes fires in these three ways.
3. (a)physical hazard
(b)chemical hazard
4.(a) If a liquid's flash point is lower than 60°C, it is regarded as flammable.
Regarding the security of spill cleaning activities, flash point is a crucial consideration.
When spilled, gasoline and other light fuels pose a considerable risk since they can ignite in the majority of ambient conditions.
(b) If your material's label contains a flame symbol, it means the substance is combustible, and you should review your SDS to learn more about the dangers and risks associated with using the substance.
(c) the lowest temperature at which combustible material ignites in air and continues to burn when heated (as in a bath of molten metal)
(d) The pressure that a vapor exerts on its condensed phases (solid or liquid) in a closed system at a specific temperature is known as vapor pressure.
(e) The difference between an object's density and that of a standard substance is its specific gravity.
Depending on its value, the specific gravity might indicate whether an object will float or sink in our reference substance.
(f) The ratio of the time needed to evaporate a test solvent to the time needed to evaporate the reference solvent under the same circumstances is the evaporation rate.
The findings can be stated as a relative rate, the percentage that evaporated within a given time frame, or the length of time needed to evaporate a given volume.
(g) The temperature at which a specific solid material melts, or transitions from a solid state to a liquid, is known as the melting point.
(h) The resistance of a fluid (liquid or gas) to a change in shape or motion of adjacent sections relative to one another is known as viscosity. Viscosity is a sign of flow resistance.
(i) The boiling point of a liquid is the temperature at which the pressure of the liquid's vapor equals the pressure of its surroundings.
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