It’s been getting really hot outside recently, and Squeaks and I are coming up with all kinds
of creative ways to stay cool.
We can find shade when we’re outside, and we can use a fan to blow the air around inside.
We have friends whose dogs really like hanging out near the fan.
But when we’re outside and it’s hot out, there’s something else they do: they breathe
in and out really fast, sometimes with their tongues sticking out.
我们称之为气喘 对于狗狗们来说 是降温的好方法
That’s called panting, and for dogs, it’s a great way to keep cool.
For us humans, there’s something that happens to our bodies when we get very warm.
Can you guess what it is?
That’s right, we sweat!
Water, along with some other stuff, like salt, goes from inside our bodies to outside on
our skin, and that helps us cool off!
Sweat cools us off because the water evaporates, meaning that it changes from a liquid to a
gas and disappears into the air.
That’s what happens when sweat dries — the liquid water turns into a gas.
And if you’ve ever spilled some water on yourself, you know that it can start to feel
very cold as it dries!
That’s because some of the heat from your body is being used to help the water evaporate.
Since your body is losing heat as it moves into the water on your skin, you feel less
So, sweating is a great way to cool down.
但是 有些动物不能像人类一样流汗 比如狗狗
But a lot of animals can’t sweat as well as humans can — including dogs.
Dogs can only sweat through the pads on their paws, which isn’t enough to cool them down
But with all that warm fur, they definitely need to be able to keep cool on a hot, sunny
因此 他们即使不能流汗 也有其他方式
So even though they mostly can’t sweat, they have other ways to keep themselves cool
in the heat.
Panting helps dogs keep cool in a way that’s actually very similar to how sweating keeps
We know that sweat keeps us cool by drying off.
Can you think of something that might be drying off as dogs pant?
Good guess, Squeaks!
There’s lots of saliva, or spit, in a dog’s mouth!
To cool themselves off, dogs pant to evaporate their saliva.
The heat from their bodies helps the saliva dry, so the dog gets less hot.
It’s a lot like how we sweat through our skin, except dogs use saliva in their mouths
As they pant, dogs breathe really fast to move more air in and out through their mouths.
When they breathe out, they move the warm, wet air away, and when they breathe in, cooler,
吸气时 就变成了凉爽的空气 并且让更多的唾液蒸发得更快
drier air can take its place and evaporate more saliva faster, so it takes less time
for a dog to go from too hot, to just right.
[Squeaks squeaks approval]
是的 这真是个降温的好方法 但比起流汗 降温速度还是更慢
Yeah, it is a pretty awesome way to cool off, but it can work a little slower than sweating.
It takes a while for a dog to evaporate enough saliva to get a lot of heat out of its body.
So when you see a dog panting really quickly, that’s a sign that it’s too hot and is
taking some time to cool down.
Maybe we should go and cool off, too, huh Squeaks?
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