Vernier Software & Technology

# Mixing Warm and Cold Water

## Introduction

Heat can be defined as energy transferred between matter because of differences in temperature. The ability of matter to transfer heat depends on its mass and temperature. A calorimeter is an instrument used to measure changes in heat energy. You can make a simple calorimeter using a Styrofoam cup to contain water, a beaker for more insulation and support, and a Temperature Probe to measure temperatures. The joule (J) is the SI unit for heat energy. An equation that can be used to calculate change in heat energy is

$H = \Delta t \cdot m \cdot {C_p}$

where H = heat absorbed or released (in J), Δt = change in temperature (in °C), m = mass (in g), and Cp = specific heat capacity (4.18 J/g°C for water).

## Objectives

In this experiment, you will

• Construct and use a simple calorimeter.
• Measure temperature.
• Mix cold and warm water.
• Determine heat lost by cooling water.
• Determine heat gained by warming water.
• Compare heat lost by cooling water and heat gained by warming water.

## Sensors and Equipment

This experiment requires each of the following Vernier sensors and equipment (unless otherwise noted):

You may also need an interface and software for data collection. What do I need for data collection?

The student-version preview includes:

• Step-by-step instructions for computer-based data collection
• List of materials and equipment

Note: The experiment preview of the computer edition does not include essential teacher information, safety tips, or sample data. Instructions for Logger Pro and other software (such as LabQuest App or TI handheld software, where available) are on the CD that accompanies the book. We strongly recommend that you purchase the book before performing experiments.

See all standards correlations for Physical Science with Vernier »

### Experiment 7 from Physical Science with Vernier Lab Book

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#### Included in the Lab Book

Vernier lab books include a CD with word-processing files of the student instructions, essential teacher information, suggested answers, sample data and graphs, and more.