The hotness or coolness of a body in regards to its sensible heat and is measured by a thermometer.
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Kelvin
It is necessary to indicate the temperature when giving the density of liquids because temperature effects the density of many liquids. For example, water increases in density as it becomes colder.
One would indicate an emergency eyewash. Another would indicate a corrosion hazard. And another would indicate the position of fire extinguishers, or of the First Aid.
Ambient refers to the temperature of the surrounding air, i.e not at parking lot level etc. Ambient means the temperature not being effected by mechanical means, like AC or any heat source. example, if you serve a wine at ambient temperature, it is not a specific number it is what ever the room is at the time.
a temperature line is a line of temperature