为什么同一地点气压时高有时低? 不然为什么有‘’气压低会是阴雨天,气压高会是晴天‘’的说法?

2024-11-06 01:14:11
推荐回答(3个)
回答1:

1.由于空气的平均分子式量为29,雨水(水蒸气)的分子式量为18,在晴天里空气中的水蒸气少。而阴雨天的水蒸气较多,因而晴天的大气压高,阴雨天的大气压低.--不太准确的分析.
2.高气压区内空气往往下沉,天气多晴朗。 低气压区的空气往往是上升而聚集在空中,遇冷则凝结成云致雨,因此易成阴雨天气。--不太明确的分析.
3.通常情况下,地面不断地向大气中进行长波有效辐射,同时大气也在不断地向地面进行逆辐射。晴天,地面的热量可以较为通畅地通过有效辐射和对流气层的向上辐散运动向外输运。阴天时,云层减少了对流层大气向外的辐散运动。云层这种保存地表和对液层热量的作用称为“温室效应”。这样,阴天地区的大气膨胀就比较厉害,从而导致阴天地区的大气横向向外扩散,使空气的密度减小,同时阴天地区大气的湿度比较大,也使大气的密度减小。因这两个因素的影响,从而导致阴天的大气压比晴天的大气压低。 同一地区,在一年之中的不同时间其大气压的值也有所不同。这叫大气压的年变化。大气压的年变化,具体又分为三种类型,即大陆型、海洋型和高山型。其中海洋型大气压的年变化刚好与大陆型的相反。通常所说的“冬天的大气压比夏天高”,指的就是大陆型大气压的年变化规律。下面对此略做分析(另外两种情况不做讨论)。 由于大气处于地球周围一个开放没有具体疆界的空间之内,这就使它与密闭容器中的气体有着很多区别。夏天,大陆中的气温比海洋上高,大气的湿度也比较大(相对冬天而言),这样大陆上的空气不断向海洋上扩散,导致其压强减小。到了冬天,大陆上气温比海洋上低,大陆上的空气湿度也较夏天小,这样海洋上的空气就向大陆上扩散,使大陆上的气压升高。这就是大陆上冬天的大气压比夏天高的原因(大气温度也是影响大气压的一个因素,但在这里决定大气压变化的因素不是气温,而是大气的流动及大气的密度)。 --这是正确回答.

回答2:

在同一地点,气压越大,空气的密度就越大,水蒸气漂浮的高度就越高,天气就晴朗。如果气压较低,空气的密度就会变小,水蒸气就会漂浮在低空或地面,形成阴雨天。

回答3:

水的质量分数是18,气体平均质量分数是29,所以空气中水越多,气压越低
会问这种问题,你物理学的挺好吧,我初中的时候也想过,嘿嘿

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