What causes the temperature change?
Variations in the sun’s energy reaching Earth. Changes in the reflectivity of Earth’s atmosphere and surface. Changes in the greenhouse effect, which affects the amount of heat retained by Earth’s atmosphere.
What happens when materials are heated or cooled?
We can change a material into its other states by heating it up or cooling it down. For example, water is a liquid at room temperature. If we cool it down, it changes into a solid – ice. If we heat it up, it changes into a gas – steam.
What happens to a solid when the temperature decreases?
Note how temperature effects the motion of the atoms or molecules in a liquid. As the temperature of a solid, liquid or gas increases, the particles move more rapidly. As the temperature falls, the particles slow down. If a liquid is cooled sufficiently, it forms a solid.
How does heat affect matter?
When heat is added to a substance, the molecules and atoms vibrate faster. As atoms vibrate faster, the space between atoms increases. The motion and spacing of the particles determines the state of matter of the substance. The end result of increased molecular motion is that the object expands and takes up more space.
How does heat affect liquids?
Heat. An increase in the temperature of a liquid causes an increase in the average speed of its molecules. As the temperature of a liquid increases, the molecules move faster thereby increasing the liquid’s kinetic energy. This property can be shown in experiments by heating liquids.
What are the three effects of heat on matter?
When a substance is heated, it can cause. Interconversion of states of matter. Thermal expansion of the substance. Chemical change.
What heat does to the body?
The heart rate increases to pump more blood through outer body parts and skin so that excess heat is lost to the environment, and sweating occurs. These changes place additional demands on the body. Changes in blood flow and excessive sweating reduce a person’s ability to do physical and mental work.
What are the symptoms of internal heat in the body?
Symptoms of heat exhaustion include:
- cold, pale, wet skin.
- extreme or heavy sweating.
- fast but weak pulse.
- nausea, vomiting, and diarrhea.
- muscle cramps.