🔍 Key Concepts

• Hydrostatic pressure increases with depth in a liquid • The bubble tube (bubbler) measures back pressure in an air line submerged in the liquid • Relationship between liquid level, depth of tube outlet, and measured pressure

💭 Think About

• Think about what happens to the pressure at the outlet of the tube as the liquid level rises higher over the tube opening. • Should the tube outlet be near the top or bottom of the tank if you want a level reading over the full range of the tank? • If pressure at depth gets larger as the liquid gets deeper, would that make the measured pressure proportional to or inversely related to the level?

✅ Before You Answer

• Remember that pressure in a static liquid increases with depth below the surface. • Identify where in the tank the tube outlet must be for the system to sense the maximum level change. • Check whether the correct statement must say proportional (increases together) or inversely related (one goes up while the other goes down).