<span>The difference between materials in relation to the time they retain a thermal signature relates to their ability to conduct and disperse heat. Since metals are generally highly conductive, metals are likely to quickly lose heat once warmed up, and therefore quickly lose their thermal signature. Plastics and rubber are however insulators and do not conduct heat very well at all. They are likely to retain their thermal signatures for longer once exposed to heat.
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In physics, work (Joule) is defined as force (Newton) times displacement (meter).
W = F * s
In chemistry, the equation is:
work = pressure x (change in volume)
In electrical work, the equation is:
work = charge x (change in voltage)
The skill that you wouldn't want to list is the ones that are irrelevant. Always list skills that are customary for the job you want.
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