Answer

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**Hint:**Firstly we have to know that what is called atm. Atm is a unit of pressure and this is a S.I unit. We also have to know the definition of atm. The standard constant value which is used to measure atmospheric pressure at sea level is one atm. Those one atm is equal to one lakh one thousand three hundred and twenty five \[(101325)\] pascals. And this one atm is also almost equivalent to \[29.9213\]inches of mercury. We can convert any value of atm to kPa which is kilopascal.

**Complete answer:**

We know that, \[1\]atm is equal to \[1.01325 \times {10^5}\] Pa.So here in this question we have \[1.2\]atm.

So \[1.2\]atm is equal to \[1.2 \times 1.01325 \times {10^5}\] Pa which means \[1.2\] atm is equal to \[121590\] Pa.

Now \[1\] Pa is equivalent to \[0.001\] kPa.

So, \[121590\]is equivalent to \[121590 \times 0.001\] kPa which is equal to \[121.59\]kPa.

**Therefore, \[1.2\] atm \[ = 121.59\,kPa\].**

**Note:**Pascal is also a unit of pressure. We have to convert pascal to kilopascal. One pascal is equal to \[0.001\] kilopascal. So firstly we have to convert atmospheric pressure to pascal and then that into kilopascal. Pascal is equal to Newton per meter square. And one kilogram is equal to \[9.81\] Newton. And one Newton is equal to \[0.10197\] kilogram. One Newton is almost equal to one Newton.one pascal is equal to also \[1kg/m.{s^2}\]. Students can get confused by all these units together. So, a detailed knowledge is required. Pascal is also an S.I unit. Rounding error may occur while calculating these types of maths.

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