Chapter 10 Lesson 2 and 3

Sunshine State Standards SC. 7. P. 11. 4- Observe and describe that heat flows in predictable ways, moving from warmer objects to cooler ones until they reach the same temperature. SC. 6. S. 6. 2- Select and analyze the measures of central tendency to summarize a data set. LA. 7. 2. 2. 3- The student will organize information to show understanding (e.g. representing main ideas through charting).

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What determines the temperature of an object? Is a measure of how hot or cold something is compared to a reference point. Remember: What tool did we learn to measure temperature with from Ch. 1 L. 3? Thermometer What were the 3 scales we discussed that are used to measure temperature? Kelvin, Celsius, and Fahrenheit Which of these scales was the official SI unit? Kelvin!

Temperature scales Fahrenheit scale- used to measure temperature in the US. Measured by degrees F. Celsius scale- Used to measure temperature in most countries. Measured by degrees C. Kelvin scale- Used in science. Measured by K. 0 Kelvin is ABSOLUTE ZERO the lowest temperature possible

Boiling point of water Freezing point of water Absolute zero

average or mean of the kinetic Temperature is the average kinetic energy of the particles in an object Find the average or mean of the kinetic energy of the particles in the pot 13+15+9+13+10 = 55 55/ 5= Mean =11 15 13 10 9 Review: What is the mode? 13 What is the range? 15-9= 6 What is the medium? 9 10 13 13 15 Medium =13 13

Thermal energy versus temperature Although thermal energy and temperature are closely related, they are not the same thing. Two objects that have the same temperature can have different thermal energies Thermal energy is the total energy of all the particles of an object Temperature is the average kinetic energy but thermal energy depends on the objects temperature, number of particles, AND the arrangement of the particles.

Both the lake and the water in the glass have the same temperature Thermal energy versus temperature Both the lake and the water in the glass have the same temperature Which has more thermal energy the lake or the glass and why?? The Lake because there are more particles in the lake then in the glass of water, even though their average kinetic energy is the same temperature.

HEAT The warm air from the room is transferring to the cooler water. The water is transferring thermal energy to the cooler ice. These transfers of energy from warm to cool will continue until the ice is melted and the water is the same temperature as the room. Heat is the transfer of energy from a warmer object to a cooler object. Heat will continue to transfer until both objects are the same temperature.

Heat transfer

What are the three ways heat is transferred Convection The heat transfer that occurs only in fluids such as air and water. Convection currents Conduction Transfers heat from one particle of matter to another within or between two objects. Touch Radiation The transfer of energy by electromagnetic waves. Does not need matter to transfer, can transfer through space.

GOT IT?? Lets see if you can follow along!

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