1. It turns out that the sunlight is most intense at noon. Even though this is true, explain why the highest temperature of the day usually happens a few hours afternoon.
Latent heat and phase change
A physical process in which a conversion among the basic states or phases of matter, i.e., solid, liquid, and gas takes place under the effect of a certain temperature and pressure is referred to as a phase change. Generally, the phase change of a substance occurs when heat transfer takes place between the substance and its surroundings. Based on the direction in which heat transfer takes place, different types of phase changes can occur.
Triple Point of Water
The branch of physics in which observer deals with temperature related properties is called thermodynamics.
Boiling Point of Water
Everyday examples of boiling is, boiling milk, heating water. One would have observed that when we heat water it goes through various stages and at one point bubbles show in water, and water keeps splashing with bubbles bursting, we in layman terms say that water is boiling.
Freezing Point of Water
In general, the freezing point of water is 0° Celsius, or 32° Fahrenheit. This is the temperature at which water will ordinarily change from its liquid state to its solid state (ice). However, there are certain conditions that can affect the freezing point of water. For example, a liquid may be supercooled or contain impurities so that it does not freeze at the ordinary freezing point.
1. It turns out that the sunlight is most intense at noon. Even though this is true, explain why the highest temperature of the day usually happens a few hours afternoon.
2. A microwave oven directly heats your food with light, by using invisible microwaves to heat the water in your food. For the questions below, imagine that you put your food in the middle of your plate, and then put that plate in the microwave. a) If you heat your food for a short period of time, only the part of your plate directly underneath your food will heat up, with the rest of the plate staying cool. Explain why this happens.
b) If you microwave your food for a longer time, the whole plate will heat up. Explain why this happens.
3. For each of the situations below: • List which of the three methods of
a) A steaming pot of water is resting on a red-hot burner.
b) A warm book is resting on the ground outside, in the Sun.
c) You microwave a bowl of soup until it is very hot. You leave it resting on the counter to cool down.
d) You sit alone in a cool room.
e) On a hot summer day, you jump into a swimming pool.
f) You roast a hot dog over a fire.
g) Make up a situation of your own that includes at least two forms of heat transfer, and then describe how heat is moving in that situation.
4. When our bodies are hot, they produce sweat, which helps to cool us down. Using this fact, determine whether your skin or sweat has a higher conductivity. Explain your reasoning.
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