Knowing the basics of heat transfer, explain: 1. Why it is faster to cook a fish using a pan? 2. Why we use cloth for "potholders" or "oven gloves" when handling pots inside the kitchen?
3. Why we can feel the heat from sun even we are inside the house?
4. Why ice melts when we hold it?
pls answer properly
3. Why we can feel the heat from sun even we are inside the house?
4. Why ice melts when we hold it?
pls answer properly
Answers & Comments
Answer:
1. because the food is exposed to air and evaporation so moisture is lost more easily and food may cook faster.
2. Pot holders need to withstand temperatures over 400 degrees Fahrenheit to protect skin from hot dishes and make a potentially harmful task harmless. A common fabric used for pot-holders is wool because it can withstand very hot temperatures.
3. Hot air naturally rises, carrying heat away from your walls and causing it to circulate throughout your home. As the hot air circulates past your skin (and you breathe it in), it warms you.
4. If two objects have different temperatures, heat will flow from the warmer object to the colder one. For instance, when you hold an ice cube, heat is transferred from your warm hand to the cold ice and melts it. Your hand feels cold because it is losing heat energy.
Answer:
1. It is faster to cook a fish using a pan because the heat is more concentrated and directly transferred to the fish, as opposed to other methods like grilling or baking where the heat has to penetrate through the layers of the food to cook it. Additionally, the pan allows for more even cooking and control over the temperature, resulting in a quicker cooking time.
2. Cloth is used for potholders or oven gloves because it provides a barrier between the hot surface and the skin, protecting the hands from burns or other injuries. Cloth is a good choice because it is able to absorb heat and provide insulation, making it an effective material for handling hot objects.
3. We can feel the heat from the sun even when inside the house because the sun's energy is able to penetrate through windows and other materials, such as walls, that are not completely opaque to light. The heat we feel is a result of the sun's radiation, which can be absorbed by objects inside the house and raise their temperature, causing them to radiate heat as well.
4. Ice melts when we hold it because our body temperature is warmer than the freezing point of water. When we touch the ice, heat is transferred from our hands to the ice, causing the temperature of the ice to increase and reach its melting point, which causes it to melt into water. This is known as the process of heat transfer by conduction.