screw compressor atau yang biasa kita kenal sebagai dengan kompresor, merupakan sebuah alat pemampat udara, menurut sumber wikipedia 
screw compressor atau pemampat adalah alat mekanik yang berfungsi untuk meningkatkan tekanan zat alir mampu pampat, yaitu gas atau udara. Tujuan dari meningkatkan tekanan dapat untuk mengalirkan atau kebutuhan proses dalam suatu sistem proses fisika maupun kimia contohnya pada pabrik-pabrik kimia untuk kebutuhan reaksi. Secara umum kompresor dibagi menjadi dua jenis yaitu kompresor dinamik dan kompresor perpindahan positif. Beberapa jenis mesin jet—seperti turbojet dan turbofan—memampatkan udara yang dibutuhkan untuk pembakaran bahan bakar. Turbin mesin jet menggerakkan kompresor udara pembakaran. Turbin jet menggerakkan screw compressor aliran aksial dan sentrifugal yang merupakan bagian dari mesin jet.
sedangkan menurut arti luas pada beberapa sumber Kompresor adalah mesin mekanis yang meningkatkan tekanan dan mengurangi volume fluida atau gas untuk berbagai aplikasi, seperti AC, pemrosesan gas, dan alat pneumatik. Alat ini mengambil gas pada tekanan rendah dan memperbesar tekanannya secara mekanis, menggunakan tenaga listrik atau bahan bakar. Terdapat berbagai jenis kompresor, termasuk piston, screw (ulir), sentrifugal, dan scroll (gulir), masing-masing memiliki cara kerja dan aplikasi khusus seperti untuk industri berat, pendingin, atau aplikasi medis yang membutuhkan keheningan. 

 A rotary-screw compressor is a type of gas compressor, such as an air compressor, that uses a rotary-type positive-displacement mechanism. These compressors are common in industrial applications and replace more traditional piston compressors where larger volumes of compressed gas are needed, e.g. for large refrigeration cycles such as chillers, or for compressed air systems to operate air-driven tools such as jackhammers and impact wrenches. For smaller rotor sizes the inherent leakage in the rotors becomes much more significant, leading to this type of mechanism being less suitable for smaller compressors than piston compressors.

The screw compressor is identical to the screw pump except that the pockets of trapped material get progressively smaller along the screw, thus compressing the material held within the pockets. Thus the screw of a screw compressor is asymmetrical along its length, while a screw pump is symmetrical all the way.

The gas compression process of a rotary screw is a continuous sweeping motion, so there is very little pulsation or surging of flow, as occurs with piston compressors. This also allows screw compressors to be significantly quieter and produce much less vibration than piston compressors, even at large sizes, and produces some

A rotary-screw compressor is a type of gas compressor, such as an air compressor, that uses a rotary-type positive-displacement mechanism. These compressors are common in industrial applications and replace more traditional piston compressors where larger volumes of compressed gas are needed, e.g. for large refrigeration cycles such as chillers, or for compressed air systems to operate air-driven tools such as jackhammers and impact wrenches. For smaller rotor sizes the inherent leakage in the rotors becomes much more significant, leading to this type of mechanism being less suitable for smaller compressors than piston compressors.

The screw compressor is identical to the screw pump except that the pockets of trapped material get progressively smaller along the screw, thus compressing the material held within the pockets. Thus the screw of a screw compressor is asymmetrical along its length, while a screw pump is symmetrical all the way.

The gas compression process of a rotary screw is a continuous sweeping motion, so there is very little pulsation or surging of flow, as occurs with piston compressors. This also allows screw compressors to be significantly quieter and produce much less vibration than piston compressors, even at large sizes, and produces some