Heat and Temperature Accuracy and Precision

Heat & Temperature HEAT TEMPERATURE Definition Measuring Device Units

Heat & Temperature HEAT TEMPERATURE Definition Flow of thermal energy Average kinetic energy Measuring Device Units

Heat & Temperature HEAT TEMPERATURE Definition Flow of thermal energy Average kinetic energy Measuring Device Calorimeter Thermometer Units

Heat & Temperature HEAT TEMPERATURE Definition Flow of thermal energy Average kinetic energy Measuring Device Calorimeter Thermometer Units Joules, calories °C, °F, K

Heat & Temperature HEAT TEMPERATURE Definition Flow of thermal energy Average kinetic energy Measuring Device Calorimeter Thermometer Units Joules, 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

Does your desk top or the desk leg feel Cooler?

You are experiencing Heat?

Is the shooter accurate/precise?

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

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. Larry Curly Moe 2.5 g/ml 4.0 g/ml 2.7 g/ml 2.0 g/ml 4.1 g/ml 3.1 g/ml 1.0 g/ml 3.3 g/ml 5.0 g/ml 4.2 g/ml Who is the most precise? Who is the most accurate? What is the percentage error (experimental error) of Larry’s reported density measurement?

Moe, he has the lowest range (0.2). 2. Who is the most accurate? 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. Larry Curly Moe 2.5 g/ml 4.0 g/ml 2.7 g/ml 2.0 g/ml 4.1 g/ml 3.1 g/ml 1.0 g/ml 3.3 g/ml 5.0 g/ml 4.2 g/ml 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 (2.9 g/ml)?

Percentage Error Larry Curly Moe 2.5 g/ml 4.0 g/ml 2.7 g/ml 2.0 g/ml

Percentage Error Larry Curly Moe 2.5 g/ml 4.0 g/ml 2.7 g/ml 2.0 g/ml  

Homework Worksheet Chapter 2 – 1 (due tomorrow). Worksheet Chapter 2 – 2 (due Tuesday). Remember that you need to show your work on calculations.