真空度是指真空干燥炉处于真空状态的程度，通常用“高真空”和“低真空”表示。 如果被测设备中的压力强于大气压，则需要使用真空计进行压力测量。 从真空计读取的值称为真空度。
真空度是指系统压力的实际值低于大气压时的值，即：真空度=大气压-绝对压力补充综合说明：真空度是指真空度 。 所谓的“真空”是指在给定空间中压力低于101325帕斯卡的气体状态。 例如，微型真空泵PH2506B的测量值为-75KPa，这意味着该泵可以抽至比测量位置的大气压低75KPa的真空状态。
在国际真空行业中通常使用的“真空度”也是用绝对压力最科学地标记的。 它指的是“极限真空度，绝对真空度，绝对压力”，但是“相对真空度”由于简单的测量方法和测量仪器而非常简单。 它通用，易于购买且价格低廉，因此也被广泛使用。
从理论上讲，两者可以相互转换。 两者的转换方法如下：相对真空度=绝对真空度（绝对压力）-测量位置处的气压，例如，如果微型真空泵VM8001的绝对压力为80KPa，则其相对真空度 约为80-100 = -20Kpa，在普通真空计上应显示为-0.02MPa。
The vacuum drying oven is specially designed for drying heat sensitive, easily decomposed and easily oxidized substances. The inert gas can be filled into the vacuum drying oven, especially some items with complex composition can be dried quickly.
The degree of vacuum refers to the degree to which the vacuum drying furnace is in a vacuum state, usually expressed as "high vacuum" and "low vacuum". If the pressure in the device under test is stronger than atmospheric pressure, you need to use a vacuum gauge for pressure measurement. The value read from the vacuum gauge is called the vacuum degree.
The vacuum degree refers to the value when the actual value of the system pressure is lower than the atmospheric pressure, namely: vacuum degree = atmospheric pressure-absolute pressure. Supplementary comprehensive description: vacuum degree refers to the vacuum degree. The so-called "vacuum" refers to the gas state in a given space with a pressure lower than 101325 Pascals. For example, the measurement value of the micro vacuum pump PH2506B is -75KPa, which means that the pump can be pumped to a vacuum state that is 75KPa lower than the atmospheric pressure at the measurement location.
The "vacuum degree" commonly used in the international vacuum industry is also the most scientifically marked with absolute pressure. It refers to "Ultimate Vacuum, Absolute Vacuum, Absolute Pressure", but "relative vacuum" is very simple due to simple measurement methods and measuring instruments. It is versatile, easy to buy and low in price, so it is also widely used.
In theory, the two can be converted to each other. The conversion method between the two is as follows: relative vacuum degree = absolute vacuum degree (absolute pressure)-air pressure at the measuring position, for example, if the absolute pressure of the mini vacuum pump VM8001 is 80KPa, the relative vacuum degree is about 80-100 = -20Kpa , It should be displayed as -0.02MPa on the ordinary vacuum gauge.