physical static is a mean of physical straws
straw is combustible_material. afm is tangible_thing. hazardous_material_emergency is physical_event. stubbing_toe is physical_contact_making_event. flammability is tangible_physical_quantity. conducting_medium is tangible_thing. straw is solid_object. straw is plant_material. fragility is tangible_physical_quantity. mechanical_fatigue is tangible_physical_quantity.