Answer:
Argon gas
Explanation:
Argon is a chemical element. Its symbol is Ar. It is the noble gas which is odorless and colorless. It is one of the most abundant gas on the earth after oxygen and nitrogen.
Argon gas is most commonly used in the panes of the thermal windows. It has 34 percent lower thermal conductivity as compared to the air and so it is more comfortable to used instead of the air. It is an inert gas and does not react with other things. It is not harmful.
The number of complete waves, or complete cycles, per unit of time is called the frequency. Because every complete wave has one crest and one trough, you can think of the frequency as the number of crests or troughs produced per unit time. The unit used to measure wave frequency is called the hertz (Hz)
Hello There!
Physical changes can be reversed whereas chemical changes can not.
Rain turning to snow is a physical change.
The snow could certainly be changed back into rain.
An example of a chemical change is making toast.
Once the toast is made, it is not possible to reverse.
In short, it is a physical change.
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- Hannah ❤
B. I’m sorry if I’m wrong ! Wasn’t sure about this question .
D. Ca (oh)2 (calcium hydroxide)