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Mengapa Air Laut Rasanya Asin?

air laut 2

Mengapa Air Laut Rasanya Asin?

Hallo sahabat Terraversity, kalian semua pasti pernah liburan ke pantai, apalagi di Indonesia terkenal dengan pantai yang sangat indah. Lantas mengapa yah air laut kok rasanya asin? Kenapa ga rasa manis atau pahit yah hehe kalau rasanya pahit mungkin nanti bakalan banyak orang yang tidak suka ke laut kali ya… serasa minum jamu pahit aja. Tapi kalau rasanya manis tetap banyak orang suka ke laut karena kebanyakan orang menyukai rasa manis. Apa kalian mau ditemenin mimin ke lautnya biar ada manis-manisnya gitu hehe ngarep…. Padahal kaliah ogah yah mending ke laut sama gebetan malah lebih manis. Oke kita kembali ke topik awal kenapa sih laut harus memiliki rasa asin ?

 

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Alasan Air Laut Asin

Rasa asin dari air laut sebenarnya berasal dari daratan. Lho kok bisa dari daratan? Kan ini lautan yang banyak airnya trus apa hubungannya sama darat? Jadi begini sahabat terraversity, saat terjadi hujan, kan air turun ke daratan dan akan diserap oleh tanah. Kemudian air yang sudah diserap sedikit demi sedikit akan keluar lagi dan beberapa akan masuk ke sungai. Dalam perjalanan yang panjang dari satu sungai ke sungai yang lain sampai menuju ke laut, air sungai membawa garam-garam mineral. Coba bayangkan laut itu kan sangat luas, berarti ada banyak sumber sungai yang mengalir menuju laut. Nah artinya kandungan garam-garam mineral yang ada dilaut akan banyak.

 

air laut 1

 

Saat air sudah mencapai ke laut, kemudian air tersebut akan menguap ke udara membentuk awan, sedangkan garam-garam mineral yang tadi dibawa tetap tinggal di air laut. Garam-garam mineral tersebut antara lain kalium, natrium, kalsium dan lainnya. Garam mineral ini diperoleh dari batu-batuan seperti kerak bumi yang dilalui sepanjang air mengalir menuju ke laut. Nah garam-garam mineral inilah yang membuat air laut memiliki rasa asin.

 

Tingkat Keasinan Antar Air Laut

Lantas mungkin kalian bertanya-tanya apakah tingkat keasinan tiap air laut itu sama yah? Baiklah sahabat terraversity, mimin bantu jawab yah. Jadi tingkat keasinan air laut yang satu dengan yang lain itu berbeda-beda apalagi jika sudah berbeda negara yah itu semakin besar perbedaannya. Oke pertama kita lihat dari luas laut itu sendiri. Semakin luas lautnya maka garam mineral yang ada semakin banyak sehingga air lautnya akan terasa lebih asin.

 

 

Kedua dari kondisi suhu yang berbeda-beda. Apakah kalian pernah mendengar nama “laut mati” ? yups laut mati itu ada di Israel. Nah di negara Israel ini memiliki suhu yang sangat panas, sehingga penguapan yang dilakukan lebih banyak maka kadar keasinan lautnya juga semakin tinggi. Nah ada sekitar 30% lebih tinggi kadar keasinannya atau sekitar 9 kali lebih asin daripada laut pada umumnya.

 

 

 

Ketiga dari faktor gunung berapi yang ada dibawah tanah. Proses yang terjadi karena adanya air larut yang bereaksi dengan batuan panas sehingga batuan tersebut akan larut atau terjadi pelapukan batu kapur yang ada di gunung berapi yang mengandung banyak garam mineral. Garam mineral ini akan terpisah dengan air karena air akan menguap sedangkan garam mineral tetap tinggal di air laut.

 

air laut 3

 

Kestabilan Air Laut

Air laut itu memiliki keasinan yang stabil lho sobat. Hal ini karena garam mineral air laut dikirim dari sungai-sungai yang sama secara terus menerus sehingga akan mengalami penguapan yang sama. Maka keasinan air laut akan stabil dan kembali ke keadaan semula. Coba sahabat Terraversity melakukan percobaan sederhana dirumah sehingga nanti bisa paham mengapa air laut berasa asin.

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Eksperimen di Rumah

Caranya kalian memasukkan satu sendok makan garam dapur ke dalam gelas kemudian tambahkan air dan aduk sampai garamnya larut ke dalam air. Kemudian panaskan air tersebut menggunakan panci. Pemanasan dilakukan sampai airnya habis, nanti setelah airnya habis pada permukaan panci akan terbentuk kristal-kristal garam. Proses ini sama halnya dengan air laut yang awalnya dari garam-garam mineral setelah mengalamu penguapan dengan cara dipanaskan maka hanya air yang menguap dan ada kristal yang tertinggal. Yah seperti itu penjelasannya yah sobat jadi sekarang sudah tidak penasaran lagi yah. Kasih tau teman kalian juga yah biar saling tukar informasi. Tunggu artikel selanjutnya yah bye bye….

Ema
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