Build a Hydrometer

When the solute is dye, you can easily tell how concentrated the solution is by looking at it? But what if the solute is sugar or salt?

Concentrated or Dilute?

Is there a way to tell how concentrated or dilute something is when it’s clear?

Hydrometers

A hydrometer is a device that floats in solutions.

Homemade Hydrometer

Building a Hydrometer

Mark Off Your Straw

and Plug It !

Number it Off and Nail It …

Concentrated or Dilute?

Warning

Need ALL materials back at the end of class.

Things float higher when the concentration of solute is higher.

Dead Sea

How does a hydrometer work?

A hydrometer floats higher in concentrated solutions and lower in dilute solutions.

Why would you need a hydrometer?

Making wine or beer.

Oceans to Lakes

What would happen to a cargo ship going from salt water to fresh water?

Why would you need a hydrometer?

On the front of boats. *Plimsoll Line

Really cold salt water

Hot fresh water

Fresh water

Hot salt water

Warm salt water

Cold salt water