She was satisfied to hear something break upon contact.

The complex and fragile thought shattered into pieces upon first contact with the alien mind.

The crystal warmed instantly upon contact with his bare hand.

In some hospital rooms, there are people living forms of existence that upon direct contact do seem even worse than death.

In some cases, mines are automatically activated upon contact with the water.

Immediately upon facial contact with cold water, the human heart rate slows down ten to twenty-five percent.

The special fluid lost its color upon contact with the air.

The turquoise color is lost upon contact with any other fluid.

Upon contact with a human body, a kind of mutual interaction takes place that can't be described.

Upon contact with water, a solid crust forms around the lava.