CN203673717U - Atmospheric pressure measuring device - Google Patents

Abstract

The utility model discloses an atmospheric pressure measuring device, which comprises a bottom plate (1), wherein a glass tube (2) is fixed on the bottom plate (1), one end of the glass tube (2) is provided with a glass valve (3) and is connected with a rubber tube (4) provided with a rubber tube clamp (5), and the other end is connected with an injection syringe (8) through a soft rubber tube (10); the upper port of a syringe cylinder of the injection syringe (8) is provided with a small hole (9), liquid mercury can be sealed in the syringe cylinder or pressed toward the glass tube (2) when a plunger of the injection syringe (8) is pushed through the small hole (9), the liquid level inside the syringe cylinder can be communicated with the atmosphere when the plunger is outwardly pulled through the small hole (9) and plugs the syringe cylinder, thereby the mercury is not prone to splash. The device can allow students to observe directly or measure the value of the atmospheric pressure, and ensures that the device is sealed and the mercury cannot splash to pollute the environment.

Description

A kind of atmosphere measuring device

Technical field

The utility model relates to a kind of physics facility, relates in particular to a kind of atmosphere measuring device.

Background technology

In physics teaching in secondary school, adopt evangelista torricelli to test to measure atmospheric value.But it is all right that this experiment is carried out in laboratory, careful, be unlikely to mercury unrestrained, for classroom instruction lecture experiment, also there are a lot of difficulties.As the mercury perfusion experimental technique with traditional, unavoidable unrestrained polluting, and cannot one man operation, student is because not through specialized training, cannot assist teacher's co-operate.This experiment is carried out teaching demonstration in a lot of schools in classroom, can only be in blackboard experiment, and this is very large regretting.

A kind of atmosphere measuring device of the present utility model, can really be with entering classrooms this important experiment, student is directly observed or record atmospheric value and assurance device sealing, and mercury can not trickled down contaminated environment.

Utility model content

The purpose of this utility model is to provide directly perceived, the effective a kind of atmosphere measuring device of a kind of method.

The purpose of this utility model is achieved through the following technical solutions:

A kind of atmosphere measuring device of the present utility model, comprising: fixing glass pipe 2 on base plate 1, and glass valve 3 is equipped with in one end of glass tube 2, and is connected with the sebific duct 4 with rubber tube clip 5, and the other end is connected with syringe 8 by flexible rubber hose 10.

On described base plate 1, the support 6 that iron wire curves is equipped with in one end, high about 7cm left and right;

Described glass tube 2 is about 1 meter, 2 millimeters of internal diameters;

Described syringe 8 syringe upper port places open an aperture 9, when syringe plunger pushes through aperture, liquid can be enclosed in the syringe of syringe 8 or press to glass tube 2, while being pulled outwardly small holes, can make mercury liquid level and atmosphere communicate, and still clog the syringe of syringe 8, mercury is difficult for unrestrained.

Before experiment, base plate 1 is erected, in syringe 8 syringes, pour mercury into, after inserting plunger and pushing through aperture 9, shut glass valve 3, mercury is sealed inside, use in order to classroom instruction experiment.

Accompanying drawing explanation

Fig. 1 is a kind of evangelista torricelli demonstrating experiment device schematic diagram of the present utility model.

In figure: 1, base plate, 2, glass tube, 3, glass valve, 4, sebific duct, 5, rubber tube clip, 6, support, 7, scale, 8, syringe, 9, aperture, 10, flexible rubber hose.

Embodiment

A kind of atmosphere measuring device of the present utility model, preferably embodiment is as shown in Figure 1 for it.

When experiment, device is disposed across on desk, touch the plunger of syringe 8, plunger slowly presses to glass tube 2 by mercury after pushing through aperture 9, in the time that mercury slug liquid level exceedes glass valve 3, shut successively after valve 3 and rubber tube clip 5, gently the plunger of syringe 8 is drawn out on aperture 9 again, makes the interior mercury face of syringe 8 identical with atmosphere, then device is established, mercury slug starts to decline, and vacuum appears in glass tube 2 upper ends.After mercury slug decline certain altitude, remain on certain position, the difference in height of two mercury faces does not change with the inclination of glass tube, and the pressure of this section of mercury slug generation just equals the atmospheric value of there and then.

The above; it is only preferably embodiment of the utility model; but protection domain of the present utility model is not limited to this; any be familiar with those skilled in the art the utility model disclose technical scope in; the variation that can expect easily or replacement, within all should being encompassed in protection domain of the present utility model.

Claims (1)

1. an atmosphere measuring device, it is characterized in that: at the upper fixing glass pipe (2) of base plate (1), glass valve (3) is equipped with in one end of glass tube (2), and be connected with the sebific duct (4) with rubber tube clip (5), the other end is connected with syringe (8) by flexible rubber hose (10); Syringe (8) syringe upper port place opens an aperture (9), when syringe plunger pushes through aperture (9), can liquid be enclosed in syringe or press to glass tube (2), while being pulled outwardly small holes (9), can make the interior liquid level of syringe and atmosphere communicate, and still clog syringe.

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