при соприкосновении

• On coming in contact with the respective electrode, the colloidal substance loses its charge.

• The freshly cut surface darkens on exposure to air.

• These alloys obtain an oxide layer immediately (up)on contact with air.

• The dissolved gas reacts instantly with OH^- on contact.

• The process by which ethylene oxide and water react in contact with (or when contacting) an ion-exchange resin is discussed in the following section.

• Meshing does not result on contact, unless the jaws are aligned.