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Sanitiser
The key physical hazard of making a sandwich might be to have an accident with a knife when cutting the meat or sandwich. If you mean health-related hazard, it would be perhaps making the sandwich with unclean hands and transferring germs or bacteria onto the food.
Health hazard choking hazard
After my opinion smoke is a chemical hazard but also physical.
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physical hazard
A physical hazard is something inside your food that will make you sick if you ingest it. It is physically hazardous to your overall health.
Broken Glass
physical hazard,mechanical hazard,chemical hazard,electric shock hazard,crt monitor high voltage hazard.
Commercial food slicers are huge machines, so it is very unlikely that one could fall into a sandwich. Further, if something that large fell onto my sandwich, it probably would not be an environmental hazard, but it might smash my sandwich.
physical hazard affects you physically but a biological or chemical hazard affect you from within. Physical hazards may cause injuries such as broken leg, cuts, wounds, etc. while biological/chemical hazards can cause injuries such as choking, inability to breath, internal bleeding .
Broken Glass