Grade 7 science- heat and temperature topic 1-3 Flashcards
How was heat used in the past?
to stay warm, cook food, boil water, stay alive, provide light, treating hides (clothes/shelter)
What is thermal energy?
Thermal energy is HEAT energy that is generated by movement of tiny particles in an object. The atoms collide and create heat.
In which state of matter does the shape be solid and how does the particle model define this?
Solids - they are rigid, fixed shape, fixed volume and cannot be squashed.
In which state of matter does the object not have a fixed shape but can be seen? How does the particle model define it?
Liquid - not rigid, no fixed shape, no fixed volume, cannot be squashed.
Which state of matter is most difficult to see? How does the particle model define it?
Gas - not rigid, no fixed shape, no fixed volume, can be squashed.
Describe a thermocouple.
It is used for furnaces that have wires that are twisted together and can turn on a pilot light.
Describe bimetallic strip.
Used for Air conditioning or hot water heater. Forced to coil more tightly.
Describe a recording thermometer.
Detects change in temperature - is ancient.
Describe Infrared Thermogram.
Detects radiation and heat - used in burning buildings - also used it to see heat loss in molding.
Name the four types of measuring devices used in heat.
Thermocouple, bimetallic strip, recording thermometer, infrared thermogram.
What is a comfortable room temperature?
20-25 degrees Celsius.
What is the normal human body temperature?
37 degrees Celsius.
What is the temperature of boiling water at sea level?
100 degrees Celsius.
What is a temperature of a slush of pure water and ice?
0 degrees Celsius.
Thermometers
measure temperature
