2.3: Dating certainly one of Stress, Temperature, Regularity, and you will Matter

2.3: Dating certainly one of Stress, Temperature, Regularity, and you will Matter

Early boffins searched the matchmaking one of several tension out of a gas (P) and its own temperatures (T), regularity (V), and you will matter (n) by carrying two of the five parameters constant (number and you may temperature, eg), differing a 3rd (particularly pressure), and you can calculating the effect of one’s transform into fourth (in this situation, volume). The real history of its findings brings several advanced examples of new scientific method.

The connection anywhere between Tension and you can Regularity: Boyle’s Law

Because stress to your a gasoline increases, the volume of your fuel decrease since gasoline dirt is pushed closer together. In contrast, once the stress on a gasoline minimizes, the fresh fuel regularity increases just like the gas dust are now able to disperse further aside. Environment balloons get big because they increase from the surroundings to regions of straight down tension because the level of this new gasoline features increased; which is, this new atmospheric gas exerts faster strain on the facial skin of your own balloon, therefore, the indoor gasoline grows through to the external and internal challenges try equivalent.

2.3: Relationships among Tension, Heat, Regularity, and you may Matter

The Irish chemist Robert Boyle (16271691) carried out some of the earliest experiments that determined the quantitative relationship between the pressure and the volume of a gas. Boyle used a J-shaped tube partially filled with mercury, as shown in Figure \(\PageIndex<1>\). In these experiments, a small amount of a gas or air is trapped above the mercury column, and its volume is measured at atmospheric pressure and constant temperature. More mercury is then poured into the open arm to increase the pressure on the gas sample. The pressure on the gas is atmospheric pressure plus the difference in the heights of the mercury columns, and the resulting volume is measured. This process is repeated until either there is no more room in the open arm or the volume of the gas is too small to be measured accurately. Data such as those from one of Boyles own experiments may be plotted in several ways (Figure \(\PageIndex<2>\)). A simple plot of \(V\) versus \(P\) gives a curve called a hyperbola and reveals an inverse relationship between pressure and volume: as the pressure is doubled, the volume decreases by a factor of two. This relationship https://datingranking.net/pl/ardent-recenzja/ between the two quantities is described as follows:

Figure \(\PageIndex<1>\): Boyles Experiment Using a J-Shaped Tube to Determine the Relationship between Gas Pressure and Volume. (a) Initially the gas is at a pressure of 1 atm = 760 mmHg (the mercury is at the same height in both the arm containing the sample and the arm open to the atmosphere); its volume is V. (b) If enough mercury is added to the right side to give a difference in height of 760 mmHg between the two arms, the pressure of the gas is 760 mmHg (atmospheric pressure) + 760 mmHg = 1520 mmHg and the volume is V/2. (c) If an additional 760 mmHg is added to the column on the right, the total pressure on the gas increases to 2280 mmHg, and the volume of the gas decreases to V/3.

where in actuality the ? symbol was understand “is actually proportional so you can.” A land out-of V in the place of step 1/P try for this reason a straight line whose slope is equivalent to the constant within the Equation 6.dos.step one and you may Formula 6.dos.step 3. Separating both parties regarding Formula 6.dos.1 of the V as opposed to P brings the same relationships anywhere between P and step 1/V. The fresh mathematical worth of the ceaseless hinges on the degree of fuel included in brand new try and on the warmth of which the fresh studies are executed. That it dating ranging from pressure and frequency is named Boyles law, as a result of its discoverer, and can end up being said below: Within ongoing temperature, the volume out of a predetermined amount of a gas is actually inversely proportional to their pressure.

Dodaj komentarz

Twój adres e-mail nie zostanie opublikowany. Wymagane pola są oznaczone *