* Mass vs. Weight: It's important to remember that mass is the amount of matter in an object, while weight is the force of gravity acting on that mass. A scale measures weight, but we can use this measurement to determine mass since the force of gravity is constant on Earth.
Here's the process:
1. Zero the Scale: Make sure the scale is properly calibrated and reads zero when empty.
2. Measure Fresh Water: Place the cup of fresh water on the scale and record the reading. This reading represents the mass of the fresh water and the cup.
3. Measure Salt Water: Carefully remove the fresh water and place the cup of salt water on the scale. Record the reading.
4. Compare: The difference between the two readings will be the mass of the salt dissolved in the water.
Important Note: Salt water will have a higher mass than fresh water because of the added salt. This is because salt (sodium chloride) has a higher density than water.
