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Convection currents stop us from being suffocated when we are asleep in bed. Why?
If you thing you are being suffocated reach for help. Go in well ventilated area to get some fresh air. If dealing with harmful chemicals read the label first to avoid inhaling fumes and to prevent yourself from getting suffocated.
Yes if your being suffocated :)
Convection! I know this was on your science ws cause it was on mine too :)
because convection currents are caused by the liquid being heated, becoming less dense due to increased kinetic energy and rising. if you are heating the top of the test tube, there is nowhere for them to 'rise' to, so no current is formed, as they do not reach a place where they cool and sink to the bottom. thus convection currents are only formed when heating the bottom of a test tube.
If you fall asleep , you can lapse into a coma.
Falling asleep: voluntary Being put to sleep: involuntary
He was fired for being found asleep on the job.
For convection current we need a material medium. But in between sun and earth there is almost vacuum. So heat transfer is mainly due to phenomenon of radiation. That too electromagnetic waves are being propagated right from the sun and stars.
Convection currents from the stove or microwave.
Convection currents are caused by uneven heating of bodies of water/air, resulting in a current as hotter air/water rises, and cooler air/water sinks. For example on a stove-top, when boiling water, the water at the bottom will warm first, being closest to the fire. Rising to the top, it will cool and sink to the bottom, creating a current. That is why covering a pot is more efficient- when the hot water rises to the top due to a convection current, it cannot lose as much heat.
The contrary concept of asleep is awake. It refers to the state of being conscious and alert, as opposed to being unconscious and in a state of rest.