一、方程求解器
EES（engineering equation solver）
EES (pronounced 'ease') is an acronym for Engineering Equation Solver. The basic function provided by EES is the solution of a set of algebraic equations. EES can efficiently solve hundreds of coupled non-linear algebraic equations. EES can also be used to solve initial value differential equations.
A major difference between EES and existing equation solving programs is the many built-in mathematical and thermophysical property functions which EES provides. For example, the steam tables are implemented such that any thermodynamic property can be obtained from a built-in function call in terms of any two other properties. Similar capability is provided many other fluids, e.g., ammonia, nitrogen, methane, propane, all common CFC refrigerants, R-134a and others. Air tables are built-in, as are psychrometric functions and JANAF table data for many common gases. Transport property functions are also provided. Thermophysical property functions operate in either SI and English units. Additional property data may be added by the user.
EES provides the capability to do parametric studies. Selected variables can be included in a spreadsheet-like table. The user determines which variables are independent by entering their values in the table cells. EES will solve the table to determine the values of all dependent variables. A plotting option is provided to display the relationship between any two variables in the table. Multiple plots can be overlayed. Publication quality plots can be output on Postscript - compatible printers.
EES offers the advantages of a simple set of intuitive commands with which a novice can quickly learn to use for solving numerical problems. The large data bank of thermodynamic and transport properties built into EES are helpful in solving problems in thermodynamics, fluid mechanics, and heat transfer. Additional data can be added by the user as functions (written in Pascal, C, or EES) or in a tabular form, which EES will automatically interpolate. As a result, EES is can be used to solve problems in any engineering application.
EES是一款（工程用）方程（公式）求解器的英文簡稱。它主要用於求解一系列的代數方程。例如：數百個非線性的方程構成的代數方程組
它和現在一般的方程求解器的一個主要不同在於，它內置了大量數學和熱力學方面的函式。例如精確實現了水蒸氣的焓熵表（H，V，S；P；T），使得由任何兩個通過函式調用時傳入的參數就能獲得水蒸氣的第三個參數值。（P，T>>H）對於象氨，氮，甲烷，丙烷，所有普通氟氯化碳製冷劑，R-134A（一種環保型製冷劑不含氯）這一類的流體EES也提供了相似的便利。空氣性質表也通過內置的濕度函式得以實現而且還同時實現了許多（如果包括不同物相有3千多組）常見氣體的JANAF熱力表。它還包括一些流質傳遞相關的函式。其中熱力學相關的函式同時支持國際標準單位和英制單位。EES還支持用戶自定義資料庫補充屬性數據。
EES能夠自動判別參數的獨立性。所選變數均被包含在一張可擴展的電子數據表格中。用戶只需要把相互獨立的變數的值填入表中對應單元中，它就能自動計算出相關變數的值並能自動生成表格中任意兩個被選變數的關係圖象。並且多張圖紙可以覆蓋生成，結果圖可以根據需要通過與程式兼容的印表機輸出到一般出版物的附錄中。
初學者通過EES只需要使用一些簡單直觀的命令就能解決許多複雜的數學問題。EES內嵌的大量熱力學和流體力學方面的數據使得它在解決工程熱力學，流體力學，傳熱學的許多問題上都顯得相當的快捷和便利。用戶還可以通過自定義函式（用PASCAL，C，EES寫成）或者表單來加入自己的數據，而這些數據將會被EES自動插入它自己內置的資料庫中。因為這些原因，EES被廣泛用於解決各個工程領域中的問題。
EES 輕鬆省節能技術
技嘉研發的 主機板 EES輕鬆省節能技術（Easy EnergySaver），
二、學校簡稱
Guancheng English Experimental School——莞城英文實驗學校的簡稱：EES
三、環境雌激素簡稱
環境雌激素，指進入人體後可產生具有模擬雌激素作用的環境毒素。常見的環境雌激素來源包括如二手菸、農藥、殺蟲劑、廢氣、食品添加劑等。
英國倫敦國王學院生殖生物學教授弗拉瑟領導的研究團隊，曾以老鼠實驗證實，環境雌激素會使男性精子讓女性卵子受精的能力受損。這項發現有助於解釋男性不育症的起因。
