i don't get this ?.......If the weather forecast stated that the pressure is 104.2kpa. then what is the pressure in the atmosphere? and what would a barometer measure in mm of mercury
need help please
101.325 kPa = 1 atmosphere = 760 mm Hg.
It's just a conversion.
so for the first anwser it would be 101.325kpa because that is the measurement of 1 atmosphere
No, of course not. You haven't converted anything. The problem states that the pressure is 104.2 kPa so to convert to atmospheres, we would have
104.2 kPa x (1 atm/101.325) = ?? atm. Notice how the units kPa in the numerator cancel with the kPa in the denominator. The unit atm doesn't cancel with anything which makes the unit of the answer atm which is what you wanted; i.e., pressure in atm. Now you do the one with mm Hg. 1 atm = 760 mm Hg.
To understand the pressure in the atmosphere and its conversion to mmHg (millimeters of mercury), we need to know the relationship between different pressure units.
1. Atmospheric pressure: The standard atmospheric pressure at sea level is approximately 101.3 kilopascals (kPa). This value can vary depending on weather conditions and altitude.
2. Conversion to mmHg: The most commonly used unit for measuring atmospheric pressure is millimeters of mercury (mmHg) or torr. To convert from kPa to mmHg, you can use the following conversion factor: 1 kPa = 7.501 mmHg.
Using the given weather forecast value of 104.2 kPa, we can calculate the equivalent pressure in the atmosphere and convert it to mmHg.
First, to find the atmospheric pressure, we subtract the standard atmospheric pressure from the given value:
Atmospheric pressure = Given pressure - Standard atmospheric pressure
Atmospheric pressure = 104.2 kPa - 101.3 kPa
Atmospheric pressure = 2.9 kPa
Next, we can convert the atmospheric pressure from kPa to mmHg:
Atmospheric pressure in mmHg = Atmospheric pressure in kPa x Conversion factor
Atmospheric pressure in mmHg = 2.9 kPa x 7.501 mmHg
Atmospheric pressure in mmHg = 21.75 mmHg
Therefore, the pressure in the atmosphere would be approximately 2.9 kPa and a barometer would measure it as 21.75 mmHg of mercury.