To prevent steam bubbles the bath is agitated.

The steam bubbles exert high pressure in the metal structure, leading to cracks and joint porosity.

The steam bubble then condenses, creating a vacuum which draws water back in through the exhaust tube.

Thus neutrons are slowed down even if steam bubbles form in the water.

When boiling just barely starts, the hottest water at the bottom exceeds 100C and blows a steam bubble.

As the hot water rises it is under less pressure and steam bubbles form.

The steam bubbles form a geyser pump, causing an upward flow.

A scatter of calved steam bubbles broke just a few hundred meters to the east, with more on the opposite side.

A much larger steam bubble surfaced directly beneath the ship.

Finally the cook pours in a sufficient quantity of water to create a steam bubble inside the jug, which he then closes with a lid.