You are measuring the weight of the atmosphere in a vertical column above your head from the Earth's surface to the atmosphere's outer reaches. Air may seem like it weighs nothing, but it is composed of a huge quantity of gas particles whizzing around in empty space. Collectively the weight of these gas particles exert a measurable value. The average weight of the atmosphere is conveniently referred to as 1 atmosphere which is equal to 101,325 pascals or 101.325 kilopascals. These are the most common units of measurement for atmospheric pressure.
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You are measuring the weight of the atmosphere in a vertical column above your head from the Earth's surface to the atmosphere's outer reaches. Air may seem like it weighs nothing, but it is composed of a huge quantity of gas particles whizzing around in empty space. Collectively the weight of these gas particles exert a measurable value. The average weight of the atmosphere is conveniently referred to as 1 atmosphere which is equal to 101,325 pascals or 101.325 kilopascals. These are the most common units of measurement for atmospheric pressure.
You are measuring the force of the impact of air molecules on the surface at which the pressure is measured.
The difference in pressure between absolute and gauge pressure.
You need to measure the mass using appropriate equipment. You can measure the volume of a textbook and a container of milk by measuring its linear dimensions and calculating the volume. It is not at all easy to measure the volume of an air balloon. You cannot use displacement of a fluid (water) because when submerged, the balloon would be experiencing water pressure and so would occupy a smaller volume. You cannot measure it by allowing the air to escape and measure that volume of air because that air will no longer be experiencing the pressure exerted by the material (rubber?) of the balloon. I have no answer to this part. Once you have the mass and volume, the density is merely mass/volume.
M3 volume
To measure the length of a hallway, you would typically use a measuring tool such as a tape measure or a measuring wheel. Start at one end of the hallway and extend the measuring tool to the other end, ensuring it is straight and taut for an accurate measurement. Record the measurement in the appropriate units, such as feet or meters, to determine the length of the hallway.
a tape measure