Which mechanisms of heat transfer will work in a vacuum quizlet?
a. Yes, heat transfer by conduction will occur through a vacuum.
Which heat transfer process is increased by profuse sweating?
Convective heat exchange increases with increasing air speed and increased differences between air and skin temperature. Evaporation of sweat from the skin cools the body. Evaporation occurs more quickly and the cooling effect is more noticeable with high wind speeds and low relative humidity.
Is sweating a physiological response?
Generalized eccrine sweating is the physiological response to an increased body temperature during physical exercise or following thermal stress, and it is the most effective means by which humans regulate their body temperature through evaporative heat loss.
Why do we sweat?
When your body temperature rises from exercise, heat, stress or hormone shifts, sweating helps keep your internal temperature at a comfortable 98.6 degrees Fahrenheit. “Sweating helps release heat, which helps maintain optimal body temperature,” says Pamela Webert, an exercise physiologist at Henry Ford Health System.
Why do we sweat Class 9?
Sweat contains water when this water evaporates due to high temperature it helps to cool our body. So, when it’s hot outside the body sweats and increases blood flow to the skin to cool down faster. Sweating not only helps to manage body temperature but also help to stay hydrated.
Why do we sweat answer?
As soon as your body’s internal temperature starts rising, your hypothalamus (a small region in your brain) tells eccrine sweat glands distributed all over your body that it’s time to start cooling you down by producing sweat. It takes energy to evaporate sweat off of your skin, and that energy is heat.
What is sweat made up of?
Sweat is a liquid made from 99% water and 1% salt and fat. Up to a quart of sweat evaporates each day. When your body becomes overheated, you sweat more. The evaporation of sweat from your skin cools your body down.
What organ is responsible for sweating?
Eccrine sweat glands are the most numerous, distributed across nearly the entire body surface area, and responsible for the highest volume of sweat excretion [5]. By contrast, apocrine and apoeccrine glands play a lesser role in overall sweat production as they are limited to specific regions of the body [7–10].
What kind of process is sweating exothermic?
Sweating is an exothermic reaction because perspiration evaporates from your skin, releasing heat into the air and cooling your body.
Is a glow stick exothermic?
No heat energy is released in glow stick reactions; all energy is released as light. Yes, it is an exothermic reaction and light energy is released (fluorescent). The glow stick does not feel warm because all of the energy released is given out as light. Glow sticks are used daily at home, for parties, concerts, etc.
Is a ice pack endothermic or exothermic?
An instant cold pack is the perfect example of an endothermic reaction. There are many possible ingredients in an instant cold pack, but they often contain solid ammonium nitrate and water.
Does temperature affect glow sticks?
Does temperature affect Glow Sticks? Yes, the warmer the temperature, the brighter the glow stick will glow. The heat will also shorten the chemical reaction time, which is of course the length of time that the light stick glows for.
Why do glow sticks glow more in hot water?
The chemical reaction taking place in a glow stick produces light instead of heat, but it is influenced by heat. Heating the reaction makes a glow stick glow brighter, but the reaction occurs faster, using up the chemicals faster. A hot glow stick glows brighter, but can only glow for a short amount of time.
Why do glow sticks glow for kids?
Glow sticks contain potential energy in the form of chemicals: fluorescent dyes and a chemical called hydrogen peroxide. When you mix the chemicals together by cracking the glow stick, they react to make new chemicals and release excess energy in the form of light, transforming chemical energy into light energy.
What are the reactants and products of glow sticks?
The glow stick contains two chemicals, a base catalyst, and a suitable dye (sensitizer, or fluorophor). This creates an exergonic reaction. The chemicals inside the plastic tube are a mixture of the dye, the base catalyst, and diphenyl oxalate. The chemical in the glass vial is hydrogen peroxide.