Respuesta :
Answer:1. Manometric pressure is the pressure above atmospheric pressure. To find it, we need to consider the weight of the piston. The weight of the piston is given as 20 kg.
2. We can convert the weight to force by multiplying it by the acceleration due to gravity (9.81 m/s^2). So, the force of the piston on the gas is 20 kg * 9.81 m/s^2 = 196.2 N.
3. The area of the piston can be calculated using the formula for the area of a circle: A = πr^2, where r is the radius (half of the diameter). In this case, the diameter is 8 cm, so the radius is 4 cm or 0.04 m. Therefore, the area is A = π * (0.04 m)^2 = 0.00502 m^2.
4. The manometric pressure can be calculated using the formula: P = F/A, where F is the force (196.2 N) and A is the area (0.00502 m^2). So, the manometric pressure is P = 196.2 N / 0.00502 m^2 = 39031.88 Pa.
5. To find the absolute pressure, we need to add the manometric pressure to the atmospheric pressure. If the atmospheric pressure is 101325 Pa, then the absolute pressure is 39031.88 Pa + 101325 Pa = 140357.88 Pa.
Therefore, the manometric pressure on the gas is 39031.88 Pa, and the absolute pressure is 140357.88 Pa.
