Abstract: According to the present disclosure, a measuring method of liquid mixture purity includes steps as follows. A storage tank is provided, wherein the storage tank is configured for storing a liquid mixture including formic acid and water. A calculating unit is provided, wherein a plurality of formic acid purity values are saved in the calculating unit. A pressure-decreasing and heating step is performed by reducing a pressure of the storage tank and heating the storage tank. A measuring step is performed by measuring in the inner space of the storage tank to obtain a pressure value, and measuring the liquid mixture simultaneously to obtain a temperature value. A calculating step is performed by inputting the pressure value and the temperature value into the calculating unit, wherein the calculating unit outputs one of the formic acid purity values corresponding thereto.

Abstract: A supporting post for motor shade includes a length-adjustable extendable post, a protective sleeve movably mounted on the extendable post, a movable fixing assembly mounted on the extendable post to provide an elastic tension, and a bottom seat with a universal joint connected to a lower end of the extendable post. The supporting post is upright erected beside a car with the movable fixing assembly elastically upward abutting on a lower edge of the car. The protective sleeve prevents the rigid extendable post from abrading the car, and the bottom seat with the universal joint allows the extendable post to stably stand on a rough or slope ground surface. A shade supported on four pieces of the extendable posts is distantly located above a car to effectively shield the car from sunlight, heat, and rainwater when the car is parked in an open-air place.