Sending data to firebase using ESP8266 and Arduino uno

Hello, I'm currently working on a project that will measure the level of water in tanks and expected results are shown in an android application... I have some questions. So, I'm using these parts:

  • Arduino Uno
  • Ultrasonic Sensor
  • ESP8266

The correspondent results from the sensor will transmit the data to the ESP8266 that will also store the data in the firebase. My question is how the can I transmit it to the ESP8266 part as I'm pretty new to this and I would appreciate any help from you guys.