If the data to be compressed is analog ( such as a voltage that varies with time ),

If a compression scheme is lossless — that is, you can always recover the entire original message by uncompressing — then a compressed message has the same quantity of information as the original, but communicated in fewer bits.

If the picture contains an area of the same color, it can be compressed without loss by saying " 200 red dots " instead of " red dot, red dot, ...( 197 more times )..., red dot.

If data which has been compressed lossily is decoded and compressed losslessly, the size of the result can be comparable with the size of the data before lossy compression, but the data already lost cannot be recovered.

If all of the ozone were compressed to the pressure of the air at sea level, it would be only 3 millimeters thick.

If the compressor could not reproduce enough data in the compressed version to reproduce the original, the result is a diminishing of quality, or introduction of artifacts.

If any humidity subsists in the compressed air, the engine will stop due to inner icing.

If the compression forces were closer to the fovea the resulting compression would cause a greater amount of macropsia at lower field angles with little effect at higher field angles where the receptor distribution is not as compressed.

If the sealing ring is tightened too much, the skirt is compressed too tightly to allow it to open and the bottle will not vent.

If the system at State A is isothermally compressed ( compressed with no change in system temperature ) then the relative humidity of the system increases because the partial pressure of water in the system increases with increasing system pressure.

If the trapped air is not allowed to escape, it is compressed by the pressure of the incoming material and is squeezed into the corners of the cavity, where it prevents filling and causes other defects as well.

If pure oxygen is used, no oxygen breathing mask or helmet is needed, but the cost of using pure oxygen is much higher than that of using compressed air.

If high pressure gas were used, then the gas would expand to pV = nRT with its compressed volume resulting in an explosion, with the attendant risk of damage or injury.

If a small cube of metal is compressed between the jaws of a press, it will contract — that is it will be squashed somewhat — and a very large force can be resisted by it without ultimate failure.

If the fluid is compressed in the magnetic field direction and the compressive stress is 2 MPa, the shear strength is raised to 1100 kPa.

If one passenger enters the car, this pressure becomes higher by the value of his weight ( the gas in the spheres compressed to an equal degree, i. e. has now become " harder ").

If aerosol cans were simply filled with compressed gas, it would either need to be at a dangerously high pressure and require special pressure vessel design ( like in gas cylinders ), or the amount of gas in the can would be small, and would rapidly deplete.

If the gas pressure inside the bell were not raised by adding gas to compensate for the outside water pressure, the bell would partially fill with water as the gas was compressed.

If the bottle ruptures, the amount of compressed air inside it ( and thus the potential energy ) will be very small, and the bottle will not explode.

If data is stored uncompressed, it takes more space but less time than if the data were stored compressed ( since compressing the data reduces the amount of space it takes, but it takes time to run the decompression algorithm ).

; Editing: If one wishes to edit data in a compressed format ( for instance, perform image editing on a JPEG image ), one will generally decode it, edit it, then re-encode it.

If the player is not capable of using the side information that has been transmitted alongside the " normal " compressed audio data, it may still be able to play the " baseband " data as usual, resulting in a dull ( since the high frequencies are missing ), but otherwise mostly acceptable sound.

If the target can change its position significantly during the 30 minutes the missile is in the air on its way, the probability of the missile destroying the target is drastically reduced.

If your house is to have a forced warm air system, cooling can be a part of it.

If the brine regenerator uses high heat, they also partially sterilise the air.

If enough electric power is available, cooling can be provided by conventional air conditioning using a heat pump.

If the collar at the bottom of the tube is adjusted so more air can mix with the gas before combustion, the flame will burn hotter, appearing blue as a result.

If the holes are closed, the gas will only mix with ambient air at the point of combustion, that is, only after it has exited the tube at the top.

If the combustion takes place using air as the oxygen source, the nitrogen can be added to the equation, as and although it does not react, to show the composition of the flue gas:

If the air mass is colder than the ground below it, it is labeled k. If the air mass is warmer than the ground below it, it is labeled w. While air mass identification was originally used in weather forecasting during the 1950s, climatologists began to establish synoptic climatologies based on this idea in 1973.

If light pressure were the cause of the rotation, then the better the vacuum in the bulb, the less air resistance to movement, and the faster the vanes should spin.

If air is heated in a region it will expand in all directions such that the velocity field points outward from that region.

If the air cools and contracts, the divergence is negative and the region is called a sink.

If the average density ( including any air below the waterline ) of an object is less than water it will float in water and if it is more than water's it will sink in water.

If extension is executed properly the discus will be at the right angle to ride on the air current and thus be taken a farther distance.

If a larger fire is necessary, the smith increases the air flowing into the fire as well as feeding and deepening the coke heart.

If a solid surface is chilled below the dew point of the surrounding air and the surface itself is colder than freezing, frost will form on the surface.

If the indoor air is very humid, rather than moderately so, water will first condense in small droplets and then freeze into clear ice.

If the vocal folds are drawn apart, air flows between them causing no vibration, as in the production of voiceless consonants.

If too much water and not enough air surrounds the plants roots, it is possible to gradually lower the medium's water-retention capability by mixing in increasing quantities of perlite.

The valuation of the Koh-i-Noor is given in the legend that one of Nader Shah's consorts supposedly said, " If a strong man should take five stones, and throw one north, one south, one east, and one west, and the last straight up into the air, and the space between filled with gold and gems, that would equal the value of the Koh-i-noor.

If the fluid is air, the force is called an aerodynamic force.