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Questions tagged [heat]

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2
votes
1answer
168 views

advantages of shivering in cold environments

When we feel cold, our the muscle tries to generate heat by shivering and the brown adipose tissue tries to generate heat by non-shivering methods. The muscle generates heat but also spends energy on ...
7
votes
1answer
364 views

How didn't large, highly active dinosaurs overheat?

The cube-square law seems to be the deciding factor when it comes to biological heat management. Small organisms with large surface areas relative to their volumes, like mice, need fast heartbeats and ...
1
vote
1answer
79 views

Is far Infrared heaters in the market truly producing healthy far Infrared and is it practical to install them at home? [closed]

I read few blogs and websites about far infrared heaters and all are very possible about this new technology. I bought one of the heaters as a test and find quite impressive also. However, I am ...
4
votes
2answers
115 views

What are the most efficient heat exchange sites on the human body?

Where on the body would be the best place to achieve the greatest cooling effect with a "cooling undergarment"? Concentrated over the kidneys, groin, inside the wrists, back of the neck?
1
vote
0answers
31 views

Human's capacity to withstand extreme heat in dry air [duplicate]

What is the maximum temperature a human can withstand for short periods of time in an environment with dry air (e.g. oven @+300F, other confined spaces) and what would be the immediate risk of being ...
1
vote
0answers
64 views

How do we feel temperature? [closed]

Recently I watched a Youtube Video by Veritasium He said we are actually feeling the rate of heat transfer, not the temperature. But how do we feel temperature? How is feeling temperature different ...
6
votes
2answers
308 views

Why don't plants get hot under sunlight?

I've read that efficiency of photosynthesis is only like 5%, and it operates on visible light spectrum, not infrared (which is heat radiation). Which means light should either be absorbed and increase ...
1
vote
0answers
26 views

Is it safe to consume foods that are hot enough to scald your skin if you touch it with your hands?

Coffee is usually served at temperatures that would burn your hands if it spilled on it. Is the inside of your mouth not affected by the same biological process as that which causes your skin to burn?...
2
votes
1answer
157 views

Why does the wavelength in curly hair differ?

Different people and animals have different wavelengths in the curls in their hair. I understand what purposes hair serves in protecting the skin from light and bugs. I am wondering about the eventual ...
0
votes
1answer
44 views

Why do people cut back on kilo-calories?

I am learning about specific heat in science and I learned about how the specific heat for water is called a calorie, but that is different to what is on the food label. On the food label, that ...
0
votes
1answer
17k views

Why does sunburn cause fever?

Today I found out that sunburns can cause fever. What I don't understand is how/why? In my understanding fever is the side effect of an immune reaction against an intruder, mainly bacteria (though I ...
0
votes
0answers
37 views

To what extent does the cooking time impact the nutritional content when boiling potatoes?

I wonder to what extent the cooking time impacts the nutritional content when boiling unpeeled potatoes with unsalted water. http://www.livestrong.com/article/340060-does-boiling-potatoes-reduce-...
2
votes
2answers
5k views

Is heat released during work due to ATP breakdown or a increased blood flow?

Is heating up of a body during work or exercise an effect of increased speed of blood or is it because of the extra energy released while harvesting energy from the ATP
3
votes
1answer
439 views

How does heat generated by metabolism differ compared with heat generated through exercise?

I am from a mathematical background so I don't have much knowledge on biology. I'm building a mathematical model to predict heat generation with parameters of metabolic heat generation and exercise ...
1
vote
1answer
220 views

How is achieved the loss of heat through vasodilation? [closed]

I know it is the widening of blood vessels, loosing heat in this way. But is it achieved through: sweat evaporation, the increase of cardiac rhythm, the increase of respiratory/ breathing rhythm or ...
2
votes
2answers
138 views

By What Mechanism Does Heat Cause Muscle Relaxation?

Heat is commonly used "loosen" muscles, but what exactly is happening to relax the muscle? It wouldn't make sense that increased blood flow alone would relax muscle.
1
vote
0answers
27 views

Unsure why Synechococcus moves at angle in cuvette

I'd really appreciate your help. I'm working with Synechococcus. In my experiment, I have Synechococcus in a solution of milli-Q water. I illuminated it with a focused white light through a pinhole ...
1
vote
1answer
80 views

ratio between heat transfer coefficient and thermal conductivity [closed]

Consider the Robin boundary condition for the diffusion/heat equation $\mathrm{u_t=a(t)u_{xx}+f(x,t)}$: $$\mathrm{-k(t)u_x(0,t)=h(t)u(0,t)}$$ or $$\mathrm{u_x(0,t)+\frac{h(t)}{k(t)}u(0,t)=0}$$ ...
4
votes
1answer
765 views

Do sweat pores change diameter?

In Cholinergic Urticaria, some people believe that the itching which is generally more in winters might be because that the diameter of sweat pores is less due to less activity(less sweat production) ...
5
votes
2answers
90 views

How and why can cold inflict pain?

I was carrying a can of very cold liquid, had something heavy in my other hand so couldn't switch hands. After a few minutes, I started to feel very intense pain. I was very surprised. cold is just ...
7
votes
1answer
2k views

Pasteurisation of orange juice and Vitamin C

In the UK at present, one of the examination boards has set a "controlled assessment" (an experiment that pupils do at school under exam conditions) that involves testing a hypothesis that vitamin C ...
11
votes
2answers
39k views

How hot can a beverage get without burning the tongue?

What is the maximum temperature that a beverage can be without burning the tongue? I suspect there's a maximum temperature that the surface tissue of a tongue can withstand without being damaged (...
4
votes
1answer
1k views

How do animals lose heat?

I remember being told as a child that dogs stick their tongue out to stay cool, because they can't sweat like us. This made sense to me. But only a couple of days ago I suddenly thought: What about ...
3
votes
1answer
427 views

What's the mechanism behind 'losing heat through your extremities'?

I can understand how if you are not circulating enough (warm) blood, by not moving much while in a cold environment, your extremities themselves lose heat, and become cold - but I don't understand how ...