Chapter 2 Heat and Temperature. Heat & Temperature HEATTEMPERATURE DefinitionFlow of thermal energy Average kinetic energy Measuring DeviceCalorimeterThermometer.

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Presentation transcript:

Chapter 2 Heat and Temperature

Heat & Temperature HEATTEMPERATURE DefinitionFlow of thermal energy Average kinetic energy Measuring DeviceCalorimeterThermometer UnitsJoules, calories°C, °F, K The omission of "degree" symbol for the Kelvin scale indicates that it is not relative to an arbitrary reference point such as the Celsius and Fahrenheit scales.

Measuring Devices

What Feels Cooler?

Explanation Heat flows from you to the desk because the desk is cooler than you. The top of the desk is an insulator. The metal leg is a conductor. The metal conducts heat away from your skin. And the sensation of losing heat makes you feel cold. Since heat leaves your hand touching the metal at a faster rate it feels colder.

Accuracy refers to how close a measurement is to the true or correct value for a quantity. Precision refers to how close a set of measurements for a quantity are to one another, regardless of whether or not the measurements are correct.

Accuracy vs Precision a a

Larry, Curly and Moe are each given the same type of metal and are asked to measure its density. The actual density of the metal is 3.0 g/ml however they are not told this. They take four sets of measurements and use these to calculate the density of the metal for each set of measurements. Their results are given below. LarryCurlyMoe 2.5 g/ml4.0 g/ml 2.7 g/ml2.0 g/ml4.1 g/ml 3.1 g/ml1.0 g/ml4.1 g/ml 3.3 g/ml5.0 g/ml4.2 g/ml 1.Who is the most precise? 2.Who is the most accurate? 3.What is the percentage error (experimental error) of Larry’s reported density measurement? See Notebook For this example:

Larry, Curly and Moe are each given the same type of metal and are asked to measure its density. The actual density of the metal is 3.0 g/ml however they are not told this. They take four sets of measurements and use these to calculate the density of the metal for each set of measurements. Their results are given below. LarryCurlyMoe 2.5 g/ml4.0 g/ml 2.7 g/ml2.0 g/ml4.1 g/ml 3.1 g/ml1.0 g/ml4.1 g/ml 3.3 g/ml5.0 g/ml4.2 g/ml 1.Who is the most precise? Moe, he has the lowest range (0.2). 2. Who is the most accurate? Curly, his average is closest to 3.0 (the accepted value). 3. What is the percentage error (experimental error) of Larry’s reported density measurement?

Percentage Error LarryCurlyMoe 2.5 g/ml4.0 g/ml 2.7 g/ml2.0 g/ml4.1 g/ml 3.1 g/ml1.0 g/ml4.1 g/ml 3.3 g/ml5.0 g/ml4.2 g/ml

Homework Worksheet Chapter 2 - 2

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