# How Does Weight Control Neutral Buoyancy?

### by, Taylor RM 18

Question

How Does Weight Control Neutral Buoyancy?

Hypothesis

If I put the same amount of helium in each of the balloons and a light weight attachment piece my "aircraft" will rise or sink depending on the amount of pennies I put into my Dixie cups, but if I put only 1 piece of paper in one of the Dixie cups that has 15 pennies then my aircraft will have neutral buoyancy.

Variables

Manipulated I'm changing the weight in one of the Dixie cups.
Controlled The amount of pennies in each cup and the setup.
Responding The aircraft will go up or down or stay where it is.

Materials

wooden dowel, clear tape, 3 helium balloons, 2 Dixie cups, 30 pennies, string (optional)

Procedures

Gather Materials Place the helium balloons 1 in the middle and 1 on each end of the wooden Dowel Put a Dixie cup in-between the middle balloon and the end balloons do this on each side Tape the balloons and the Dixie cups onto the wooden Dowel Fill the Dixie cups with 15 pennies each Cut a 2 by 2 piece of paper and put the piece of paper in one of the Dixie cups By now your aircraft should float nicely

Research

What Is Neutral Buoyancy?Well, neutral buoyancy is actually for weight. As in my experiment here if I were to put a little square piece of paper in just one of my Dixie cups, my aircraft will balance itself. I know what your thinking how does it do that all by its self?An object that has Neutral Buoyancy will not go up or down it will stay in its place. Well THATS neutral buoyancy! Fascinating, Huh? If I were to put another piece of paper in the other Dixie cup the aircraft would sink slowly (ask for demonstration). Also if I take both pieces of paper out of the Dixie cups the aircraft will rise and lift itself up. The reason it lifts itself up is because the helium in the balloons. Helium is a chemical element with symbol He and atomic number 2. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas that heads the noble gas group in the periodic table. Most helium in the universe is helium-4, and is believed to have been formed during the Big Bang. Large amounts of new helium are being created by nuclear fusion of hydrogen in stars.Helium is named for the Greek god of the Sun, Helios. It was first detected as an unknown yellow spectral line signature in sunlight during a solar eclipse in 1868 by French astronomer Jules Janssen. Janssen is jointly credited with detecting the element along with Norman Lockyer. Janssen observed during the solar eclipse of 1868 while Lockyer observed from Britain. Lockyer was the first to propose that the line was due to a new element, which he named. The formal discovery of the element was made in 1895 by two Swedish chemists, Per Teodor Cleve and Nils Abraham Langlet, who found helium emanating from the uranium ore cleveite.