The molecules of gas have a comparatively large space between them. Conduction occurs only in solids which have closely packed molecules whose motion is restricted to vibration in the same position within the solid mass. The addition of heat energy, due to this compactness, is translated to Kinetic Energy (greater vibrational motion) which is immediately transferred to neighbouring molecules and the Heat Transfer by Conduction is Achieved. Conduction is the fastest form of Heat transfer. Convection, heat transfer in fluids (Liquids and Gases) is due to rising currents of fluid due to decrease in Density.
A human should have a body temperature of 37°C. If the body temperature drops below 37°C, metabolic reactions become more gradual because molecules move more gradual and have less kinetic energy. If the temperature elevates above 37°C, the enzymes of the body commence to get denatured and metabolic reactions will be much more gradual. Sometime the temperature of our environment is very low enough to decrement your body temperature and other time it is high enough to raise your body temperature. This is why our body has the ability to control its body temperature.
When an endothermic reaction occurs, heat it taken in making the pack cool down, and in an exothermic reaction occurs heat is released making the pack warm up. This is able to happen because the energy from the environment (surroundings) is either being absorbed or released to help the crystalline substance to dissolve. One will be able to tell if the substance will be a good candidate for a hot pack or cold pack based on change in temperature. If there is a negative change in temperature than an endothermic reaction has occurred, lowing the temperature of the content in the cold pack. Then when an exothermic reaction occurs, the temperature change is positive, making it a good candidate for a hot pack.
So, it makes sense that the speed of sound has the same order of magnitude as the average molecular speed between collisions. In a gas, it is particularly important to know the temperature. This is because at lower temperatures, molecules collide more often, giving the sound wave more chances to move around rapidly. At freezing (0º Celcius), sound travels through air at 331 meters per second (about 740 mph). But, at 20ºC, room temperature, sound travels at 343 meters per second (767 mph).Liquids:Sound travels faster in liquids than in gases because molecules are more tightly packed.
Introduction When a substance is in the gas state, its molecules are very spread out and are in constant motion. They are in constant collision with the walls of their container. The speed of the molecules in a gas depends on the environment around it. Environmental conditions around the molecules, such as temperature affect the speed. For example, if the temperature increases, then the speed of the molecules increases.
P1 POSSIBLE 6 MARKS QUESTIONS 1. A vacuum flask is designed to reduce the rate of energy transfer by heating process. Describe how the design of a vacuum flask keeps the liquid inside hot? • The plastic cap of the vacuum flask is a good insulator, so it reduces the heat transfer by conduction. It stops convection currents formed at the top of the flask thereby stopping convection.
As you would already know that exothermic reactions tend to release quite a large amount of heat, so when the reaction mixture gets very warm, a very hot exothermic reaction begins. [2] How industry controls the risks of thermal runaway reaction/ Protective measures used for consequences of runaway reactions. “Protective measures include emergency venting or relief systems, inhibition and containment.”[3] Bibliography: 1) http://writepass.co.uk/journal/2012/11/thermal-runaway-reactions-are-characterised-by-progressive-increases-in-the-rate-of-heat-generation-temperature-and-pressure/ 2) http://wall-paper3.blogspot.co.uk/2011/12/why-do-you-think-thermal-runaway.html 3)
Copper vs. Fiber The advantage of having fiber is obviously going to overcome the advantage of having copper. However, there are certain areas where copper will be better fit than fiber cables. Hard to believe but let’s just point out some advantages and disadvantages of each to see which will best fit where you want to put it. Fiber cabling is growing very fast due to how much more efficient it is than copper cabling.
the higher the altitude the cooler the air becomes in general. The air cools, condenses and turns to minute water droplets at these higher altitudes to produce more moisture in the air which in turn leads to greater amounts of rainfall. The lower altitudes with the warmer air can hold more water vapour and less therefore condenses to form rainfall. The hypothesis is based solely on the basis that air becomes cooler with increasing altitude. HYPOTHESIS Aberporth weather
This hypothesis was chosen because it’s easier to digest hot water than it cold. Materials and Methods There were multiple materials and methods used for this particular latent lab. For example, the groups used the hot plate to heat up the water to different temperatures. Another material that was used was the thermometer used to check the temperature