Question

the table shows the densities of four solid objects in grams per milliliter at 25°c.
object | density (g/ml)
aluminum cube | 2.70
crayon | 0.93
marshmallow | 0.41
plastic fork | 0.91
water has a density of 1.00 gram per milliliter at 25°c. use the density values to predict which objects will float or sink when placed in water.
crayon aluminum cube plastic fork marshmallow
floats in water
sinks in water

Explanation:

An object floats in water if its density is less than water's density ($1.00\ \text{g/mL}$), and sinks if its density is greater. Compare each object's density to $1.00\ \text{g/mL}$:

• Crayon ($0.93\ \text{g/mL}$): $0.93 < 1.00$ → floats
• Marshmallow ($0.41\ \text{g/mL}$): $0.41 < 1.00$ → floats
• Plastic fork ($0.91\ \text{g/mL}$): $0.91 < 1.00$ → floats
• Aluminum cube ($2.70\ \text{g/mL}$): $2.70 > 1.00$ → sinks

Answer:

Floats in water: crayon, marshmallow, plastic fork
Sinks in water: aluminum cube