Density and Buoyancy: Mixing Hot and Cold Water

Learning Resource Type

Classroom Resource

Subject Area

Science

Grade(s)

5

Overview

We've all seen substances change as a result of changes in temperature. Water heated on the stove eventually changes from a liquid to a gas and seemingly disappears as it disperses into the air. But even at lesser extremes, temperature affects the density of water. In this video segment adapted from ZOOM, a cast member demonstrates how temperature affects the way water molecules react with one another.

Science (2015) Grade(s): 5

SC15.5.3

Examine matter through observations and measurements to identify materials (e.g., powders, metals, minerals, liquids) based on their properties (e.g., color, hardness, reflectivity, electrical conductivity, thermal conductivity, response to magnetic forces, solubility, density).

UP:SC15.5.3

Vocabulary

  • color
  • hardness
  • reflectivity
  • electrical conductivity
  • thermal conductivity
  • response to magnetic forces
  • solubility
  • density
  • measurement (quantitative and qualitative)
  • data
  • observable properties
  • standard units
  • conductors
  • nonconductors
  • magnetic
  • nonmagnetic

Knowledge

Students know:
  • Materials have different properties-color, hardness, reflectivity, electrical conductivity thermal conductivity, solubility, and density.
  • Measurements of a variety of properties can be used to identify materials.
  • Measurements should be made in standard units (e.g., grams & liters).

Skills

Students are able to:
  • Identify the phenomenon through observations about materials, including color, hardness, reflectivity, electrical conductivity, thermal conductivity, response to magnetic forces, and solubility.
  • Identify the evidence and collect data about the observed objects in standard units (e.g., grams, liters).
  • Collaboratively plan the investigation.
  • Identify materials based on their properties.

Understanding

Students understand that:
  • Standard units are used to measure and describe physical quantities of materials such as weight, time, temperature, and volume. These measurements will assist in the identification of the materials ( e.g. powders, metals, minerals, and liquids).

Scientific and Engineering Practices

Planning and Carrying out Investigations

Crosscutting Concepts

Scale, Proportion, and Quantity

CR Resource Type

Audio/Video

Resource Provider

PBS

License Type

Custom
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